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 Fig. 1  Fig. 2 | EB 8420-73 Features manual-wind chronograph, 60s, 15min, cam switched sub second date: quickset by reverse setting Data 12''', Dm= 27.0mm H= 6.8mm 1/17 jewels f = 18000 A/h power reserve 41h Mainspring / battery 1.35 x 9.5 x 0.135 x 280mm Hands 1.50 x 0.90 x 0.25 / 0.20 x 0.20mm Comments about the data | Remarks 1973-1974 pin-lever escapement indirect minute, hand friction clutch on barrel (Roskopf type, space for big balance) There are several variants in this family. But they are poorly recorded, and therefore only known variants are listed here. The movements are often or always signed with the designation of the mostly made variant. Therefore here codes for features are attached to this signature, if the official designation is not known. family/generations: layout for sub second: 8400: 10.5''', no second 8401: 10.5''', sub second 8404-8406: 10.5''', * 8410: 11.5''', no second 8411: 11.5''', sub second 8414-8416: 11.5''', * 8420: 8420: 12''', chronograph, date 8421-8425, 8428: 12''', * 8429: 8429: 13.5''', chronograph, date 8450: 8.75''', no second 8451: 8.75''', sub second 8454-8456: 8.75''', * layout for sweep second: 8460: 8.75''', no second 8461: 8.75''', sweep second 8462-8467: 8.75''', * 8480: 10.5''', no second 8481, 8488: 10.5''', sweep second 8482-8487: 10.5''', * 8490: 11.5''', no second 8491: 11.5''', sweep second 8492-8497: 10.5''', * suffix -73: new balance, since 1973 suffix -74: set lever held by spring instead screw, since 1974 *) mentioned in various parts catalgues, but without assigning to particular features Example, year: signature; shock device ca. 1975: Sorna Watch, Swiss, EB 8420-74, 17 Jewels; Novodiac (EB 8420-74) Not for Sale! The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating. |
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