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Elgin Mainspring Information The follow information on mainsprings was collected from the Elgin material catalogs from the years 1896, 1904, 1915, 1950, and 1958. Elgin made many different mainsprings over the years, with some part numbers replacing others as time went on. All part numbers are listed so that if you either find an old mainspring or you need an mainspring, you can identify equivalent ones. This table is sorted from the largest sized watch to the smallest. Within the same watch size, the mainsprings are sorted from lowest part number to highest, and then by the thinnest version of a part to the thickest. notes: m=X stands for "model X" g=X stands for "Grade X" dp stands for "Dura-Power", Elgin's 'unbreakable' mainsprings. FP stands for "full plate" KW stands for "key wind" Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 37 4457 m=1   8 day .184 .0095 ? 4.67 .240 ? ? ? ? Size 22 4935 m=1,2   8 day .215 .00825 ? 5.46 .209 ? ? ? ? .215 .0085 ? 5.46 .215 ? ? ? ? .215 .00875 ? 5.46 .222 ? ? ? ? Size 18 812 FP and 18s 3/4 w/going barrels .115 .00825 22.5 2.92 .209 ? ? ? ? .115 .0085 22.5 2.92 .215 ? ? ? 21j .115 .00875 22.5 2.92 .222 ? 20 1½ 17j .115 .009 22.5 2.92 .229 ? 20 1¼ 7j, 15j 817 m=6 (convertibles) .104 .008 22.0 2.64 .203 ? 17 2½ 7j, 15j 1956 3/4 w/steel safety barrels .154 .00675 25.5 3.91 .171 ? ? ? 23j .154 .007 25.5 3.91 .177 ? 30 3¾ 19j, 21j 2096 FP .115 .0085 22.5 2.92 .215 ? 20 2 21j 2446 FP .115 .0085 22.5 2.92 .215 ? 20 2 21j 2324 FP   tongued, not braced .115 .00875 22.5 2.92 .222 ? 20 1½ 15j .115 .009 22.5 2.92 .229 ? 20 1¼ 7j 2325 m=6 (convertibles) tongued, not braced .104 .008 22.0 2.64 .203 ? 17 2½ ? Size 17 816 m=1,2 .115 .0085 19.0 2.92 .215 ? 20 2 7j, 11j Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 16 817 all models w/going barrels .104 .00725 22.0 2.64 .184 ? 17 3¼ ? .104 .0075 22.0 2.64 .190 ? 17 3 21j .104 .00775 ? 2.64 .196 ? ? ? 15j, 17j .104 .008 22.0 2.64 .203 ? 17 2½ 7j, 15j 2325 tongued, not braced .104 .00725 22.0 2.64 .184 ? 17 3¾ ? .104 .0075 22.0 2.64 .190 ? 17 3 7j, 15j 2447 m=1,2,6,7,9 .104 .00725 22.0 2.64 .184 ? 17 3¾ ? 2448 m=1,2,6,7,9 tongued, not braced .104 .00725 22.0 2.64 .184 ? 17 3¾ ? 2542 all models w/steel safety barrels .104 .00725 ? 2.64 .184 ? ? ? 21j, 23j .104 .0075 ? 2.64 .190 ? ? ? 17j, 19j 4931 m=32 having motor barrel (g=540) .104 .007 ? 2.64 .177 ? ? ? ? .104 .00725 ? 2.64 .184 ? ? ? ? .104 .0075 ? 2.64 .190 ? ? ? ? 5980 timer .104 .0085 ? 2.64 .215 ? ? ? ? 6164 dp grades: 571 572 573 574 575 616 .115 .0063 ? 2.92 .160 ? ? ? ? .115 .0065 ? 2.92 .165 ? ? ? ? .115 .0067 ? 2.92 .170 ? ? ? ? .115 .0069 ? 2.92 .175 ? ? ? ? .115 .0071 ? 2.92 .180 ? ? ? ? .115 .0073 ? 2.92 .185 ? ? ? ? Size 14 817 m=1 .104 .0075 ? 2.64 .190 ? ? ? ? 2325 tongued, not braced .104 .0075 ? 2.64 .190 ? 17 3 ? 2239 m=2 .081 .0075 ? 2.05 .196 ? ? ? ? .081 .00775 ? 2.05 .196 ? ? ? 7j, 15j, 17j Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 12 823 m=1 KW .092 .007 19.5 2.33 .177 ? 14 3¾ ? 1712 m=2,3 w/steel barrels .088 .00725 20.5 2.23 .184 ? ? ? 19j, 23j .088 .0075 20.5 2.23 .190 ? 14 3 7j, 15j, 17j 1720 m=2,3 w/thick going barrels .088 .00725 ? 2.23 .184 ? ? ? ? .088 .0075 20.5 2.23 .190 ? 14 3 7j, 15j, 17j 2339 m=2,3 w/thin going barrels pre-db version of the 6093(?) .081 .00725 ? 2.05 .184 ? ? ? ? .081 .0075 ? 2.05 .190 ? ? ? 17j .081 .00775 20.5 2.05 .196 ? 12 3½ 7j, 15j 2449 m=2,3 w/steel barrels .088 .0075 20.5 2.23 .190 ? 14 3 ? 2874 m=4 streamline and Corsican. .065 .007 ? 1.65 .177 ? ? ? ? .065 .00725 ? 1.65 .184 ? ? ? 17j .065 .0075 ? 1.65 .190 ? ? ? ? 4640 g=446 Hulburd .047 .007 ? 1.19 .177 ? ? ? 19j 6093 dp m=2,3 w/thin going barrels .081 .0073 ? 2.05 .185 ? ? ? ? .081 .0075 ? 2.05 .190 ? ? ? ? .081 .0077 ? 2.05 .195 ? ? ? ? Size 10 823 m=1 KW .092 .007 19.5 2.33 .177 ? 14 3¾ 7j, 15j 2326 m=1 KW tongued, not braced .092 .007 19.5 2.33 .177 ? 14 3¾ 7j, 15j 5726 g=542, 543, 546 .065 .0067 ? 1.65 .170 ? ? ? ? 6001 dp g=542, 543, 546 .065 .0067 ? 1.65 .170 ? ? ? ? .065 .0069 ? 1.65 .175 ? ? ? ? .065 .0071 ? 1.65 .180 ? ? ? ? .065 .0073 ? 1.65 .185 ? ? ? ? Size 6 824 m=1,2 .074 .00675 17.5 1.88 .171 ? 10 4¼ 17j .074 .007 17.5 1.88 .177 ? 10 3¾ 7j, 15j 2327 m=1,2   tongued, not braced .074 .00675 17.5 1.88 .171 ? 10 4¼ ? .074 .007 17.5 1.88 .177 ? 10 3¾ 7j, 15j Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 0 825 m=1 .050 .006 ? 1.27 .158 ? ? ? ? .050 .00625 16.0 1.27 .158 ? 4 5 7j, 15j 1713 m=2,3 w/steel safety barrels .065 .00525 ? 1.65 .133 ? ? ? ? .065 .0055 17.5 1.65 .139 ? 8 6¼ 7j, 15j, 17j 2097 m=2,3 w/going barrels .065 .00525 ? 1.65 .133 ? ? ? ? .065 .0055 17.5 1.65 .139 ? 8 6¼ 15j, 17j .065 .00575 ? 1.65 .146 ? ? ? 7j 2328 m=1   punched .050 .00625 16.0 1.27 .158 ? 4 5 7j, 15j 2450 m=1,2 .065 .0055 17.5 1.65 .139 ? 8 6¼ ? 6094 dp m=1 .050 .0058 ? 1.27 .147 ? ? ? ? .050 .0060 ? 1.27 .152 ? ? ? ? .050 .0062 ? 1.27 .157 ? ? ? ? 6095 dp m=2,3 w/going barrels .065 .0051 ? 1.65 .129 ? ? ? ? .065 .0053 ? 1.65 .134 ? ? ? ? .065 .0055 ? 1.65 .139 ? ? ? ? Size 3/0 6095 dp m=2,3 w/going barrels .065 .0051 ? 1.65 .129 ? ? ? ? .065 .0053 ? 1.65 .134 ? ? ? ? .065 .0055 ? 1.65 .139 ? ? ? ? Size 4/0 4789 pre-dp version of the 6096(?) ? .00475 ? ? ? ? ? ? ? 6096 dp m=1 .074 .0043 ? 1.88 .109 ? ? ? ? .074 .0045 ? 1.88 .114 ? ? ? ? .074 .0047 ? 1.88 .119 ? ? ? ? Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 5/0 2705 m=1 g=380 only .050 .005 ? 1.27 .133 ? ? ? ? .050 .00525 ? 1.27 .133 ? ? ? 15j 2890 m=1,2 .050 .0045 ? 1.27 .114 ? ? ? 15j .050 .00475 ? 1.27 .120 ? ? ? 7j 6097 dp m=1 g=380 only .050 .0049 ? 1.27 .124 ? ? ? ? .050 .0051 ? 1.27 .129 ? ? ? ? .050 .0053 ? 1.27 .135 ? ? ? ? 2897 m=1,2   pre-dp version of the 6098(?) seen as "5/0-6/0" on eBay 292675290 ? ? ? ? ? ? ? ? 7j 6098 dp m=1,2 .050 .0041 ? 1.27 .104 ? ? ? ? .050 .0043 ? 1.27 .109 ? ? ? ? .050 .0045 ? 1.27 .114 ? ? ? ? Size 6/0 2897 m=1,2   pre-dp version of the 6098(?) seen as "5/0-6/0" on eBay 292675290 ? ? ? ? ? ? ? ? 7j 6098 dp m=1,2 .050 .0041 ? 1.27 .104 ? ? ? ? .050 .0043 ? 1.27 .109 ? ? ? ? .050 .0045 ? 1.27 .114 ? ? ? ? Size 8/0 5015 pre-dp version of 6002(?) ? ? ? ? ? ? ? ? ? 6002 dp .065 .0033 ? 1.65 .084 ? ? ? ? .065 .0035 ? 1.65 .089 ? ? ? ? .065 .0037 ? 1.65 .084 ? ? ? ? .065 .0039 ? 1.65 .099 ? ? ? ? .065 .0041 ? 1.65 .104 ? ? ? ? .065 .0043 ? 1.65 .109 ? ? ? ? .065 .0045 ? 1.65 .114 ? ? ? ? Size 10/0 1957 m=1 .050 .0045 10.5 1.27 .114 ? 4 7¼ 17j .050 .00475 ? 1.27 .120 ? ? ? 15j 6099 dp m=1, 4, 5 .050 .0041 ? 1.27 .104 ? ? ? ? .050 .0043 ? 1.27 .109 ? ? ? ? .050 .0045 ? 1.27 .114 ? ? ? ? Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 13/0 g711 dp g=630, 711-719, 721, 724 ? .0036 ? ? .091 ? ? ? ? ? .0037 ? ? .094 ? ? ? ? ? .0038 ? ? .097 ? ? ? ? g730 dp g=730 ? .0040 ? ? .102 ? ? ? ? ? .0041 ? ? .104 ? ? ? ? ? .0042 ? ? .107 ? ? ? ? g750 dp g=750 ? .0042 ? ? .107 ? ? ? ? ? .0043 ? ? .109 ? ? ? ? ? .0044 ? ? .112 ? ? ? ? Size 15/0 5550 pre-dp version of 6003(?) ? .0042 ? ? .107 ? ? ? ? 6003 dp .050 .0034 ? 1.27 .086 ? ? ? ? .050 .0036 ? 1.27 .091 ? ? ? ? .050 .0038 ? 1.27 .097 ? ? ? ? .050 .0040 ? 1.27 .102 ? ? ? ? .050 .0042 ? 1.27 .107 ? ? ? ? .050 .0045 ? 1.27 .114 ? ? ? ? Size 16/0 6099 dp m=2 .050 .0041 ? 1.27 .104 ? ? ? ? .050 .0043 ? 1.27 .109 ? ? ? ? .050 .0045 ? 1.27 .114 ? ? ? ? Size 18/0 6099 dp m=1, 3 .050 .0041 ? 1.27 .104 ? ? ? ? .050 .0043 ? 1.27 .109 ? ? ? ? .050 .0045 ? 1.27 .114 ? ? ? ? Size 19/0 6330 dp g=660, 661, 662, 666, 667, 668, W800 .060 .0027 ? 1.52 .069 ? ? ? ? .060 .0029 ? 1.52 .074 ? ? ? ? .060 .0031 ? 1.52 .079 ? ? ? ? Part Num Models or Grades Inches Millimeters Dennison Suitable for Width Thick Len Width Thick Len Width Thick Size 20/0 5015 pre-dp version of 6100(?) ? ? ? ? ? ? ? ? ? 6100 dp m=1 oval .044 .0033 ? 1.12 .084 ? ? ? ? .044 .0035 ? 1.12 .089 ? ? ? ? .044 .0037 ? 1.12 .091 ? ? ? ? g700 dp g=700-705, 740, 742, 743, 744, W803 ? .0026 ? ? .066 ? ? ? ? ? .0027 ? ? .069 ? ? ? ? ? .0028 ? ? .071 ? ? ? ? Size 21/0 6004 dp g=533, 535, 541, 547, 620 sweep sec .050 .0034 ? 1.27 .087 ? ? ? ? .050 .0036 ? 1.27 .091 ? ? ? ? .050 .0038 ? 1.27 .097 ? ? ? ? .050 .0041 ? 1.27 .104 ? ? ? ? 6005 dp g=617, 617L, 619, 619L .050 .0028 ? 1.27 .071 ? ? ? ? .050 .0030 ? 1.27 .076 ? ? ? ? .050 .0032 ? 1.27 .081 ? ? ? ? 6246 dp g=650, 651, 655, 656 .060 .0025 ? 1.52 .064 ? ? ? ? .060 .0027 ? 1.52 .069 ? ? ? ? .060 .0029 ? 1.52 .074 ? ? ? ? Size 26/0 6101 dp m=1 g=512, 513 .044 .0031 ? 1.12 .079 ? ? ? ? .044 .0033 ? 1.12 .084 ? ? ? ? .044 .0035 ? 1.12 .089 ? ? ? ? Size Auto 6329 dp g=607, 618 .050 .0033 ? 1.27 .084 ? ? ? ? .050 .0035 ? 1.27 .089 ? ? ? ? .050 .0037 ? 1.27 .094 ? ? ? ? g627 dp g=627, 643 ? .0035 ? ? .089 ? ? ? ? ? .0036 ? ? .091 ? ? ? ? ? .0037 ? ? .094 ? ? ? ? g644 dp g=644, 645 ? ? ? ? ? ? ? ? ? Conversion formulas: W_inches = W_mm / 25.4 T_inches = T_mm / 25.4 L_inches = L_mm / 25.4 W_dennison = (W_mm * 10) - 9 T_dennison = -(T_mm - 0.25) / 0.014 L_dennison = L_mm * 25.4

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