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DIFFERENCES BETWEEN CALS. 11, 11-C, 11-2 AND 12
In Response To: Cal. 11, 11 I or 12. Help with identification ()

CAL. 11

Original basic calibre, 19,800 train (nickel plated)

CAL. 11-C

As Cal.11 but we the arrangement of the calendar is changed. Rapid calendar replacement by a slow calendar. For that, the calendar wheel No.2556/1 is changed and omitted the two wheels Nos.2543 and 2548. The mainspring and escapement have been rectified.

Cal. 11-2

This is Cal. 11-c altered to 21,600 train. For that the mainspring is changed:- MgS = 1200, Mgi = 1050, M - 3.5 = 860 at 8 turns of winding. Allso the fourth wheel No.225 (72 teeth instead of 66) is changed, The escape wheel No 705 (diam. of pinion 0.67 instead of 0.73) and the frequency of the balance and hairspring
No. 721.

Cal .12

Same construction as Cal. 11-2 except that the brass parts are gold plated instead of nickel plated. (Plates, bridges, chronograph plate, etc.)

hope that helps

Ape

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