PRIM 68.4 / 684

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11 1/2”’ | Hand Wind | Swiss Lever | Sweeping Seconds | Date

Remarks:

Date with quick setting by turning back to 23:30
As the marking of the dot under the balance is often faint, the movement often reads 68x instead of 68.x
Over the course of time, the caliber 68 was built in various 68.x variants, which differ in some design features (see extra picture)
According to a personal e-mail from PRIM, the caliber 68.2 never went into production. They were supposed to have a riveted balance instead of the pressed one
As caliber PRIM 66 also available without date

Listing ID: 2208
Manufacturer / Brand: PRIM
Caliber: 68.4 / 684
Size in French Lignes: 11 1/2''' (25.7 mm) (11''' according to manufacturer)
Size range mm largest diameter: 22 - 31 mm
Shape: Round
Winding: Manual (Crown)
Hands Setting: Crown
Seconds Hand: Sweeping seconds (central seconds)
Escapement: Lever (Swiss, English, Glashütte)
Date, Day, Month...: Date
Jewels: 17
Setting Lever Screw/Pin Position: Right
Balance Position: Bottom (120 - 240°)
Shock Protection: Kif Satellor
Beats per hour: 18,000
Balance Type: Gold-plated Nickel?
Power Reserve: Unknown
Production Period: 1976 - 1993 (all variants of the caliber 68 from 1967 - 1993)
Identification: Marked 68.4 under the balance wheel
External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-5#post-1540969
Country: Czech Republic