PRIM 66

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

Remarks:

Over the course of time, the caliber 66 was built in various 66.x variants, which differ in some design features (see extra picture)
According to a personal e-mail from PRIM, the caliber 66.2 never went into production. They were supposed to have a riveted balance instead of the pressed one
The movement shown here has a 3-arm balance wheel instead of the 2-arm one. It is possible that there were transitions between the 66 and 66.1 variants or that the balance was swapped
As caliber PRIM 68 also available with date

Listing ID: 2207
Manufacturer / Brand: PRIM
Caliber: 66
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...: None
Jewels: 17
Setting Lever Screw/Pin Position: Right
Balance Position: Bottom (120 - 240°)
Shock Protection: Incabloc
Beats per hour: 18,000
Balance Type: Gold-plated Nickel?
Power Reserve: Unknown
Production Period: 1965 - 1993 (all variants of the 66.x caliber)
Identification: Marking 66 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-40#post-5218835
Country: Czech Republic