Mechanism: 
Also known as the FF30. This is a Rolex modified ebauche movement made by Fontmelon (FHF). Likely only used in Rolex models for the Canadian market ca. 1935-1945
variants with sub- and sweep second signed with 59. Data
10.5''', Dm= 23.3mm, Do= 23.7mm;
H= 4.2mm;
15/17 jewels;
f = 18000 A/h;
power reserve 40h;
Balance staff U1317;
Stem W1110;
Mainspring / battery:
Zf1389, 1.70 x 9.0 x 0.10 x 290mm;
Hands:
1.40 x 0.70mm
Item created by: gdm on 2018-10-12 20:23:00. Last edited by gdm on 2018-10-12 20:24:02
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