Unitas 6410  Features
manual wind sub second

Data
13''', Dm= 29.0mm, Do= 29.4mm
H= 3.85mm
F= 0.8mm
T= 1.7mm
15/17 jewels
f = 18000 A/h
power reserve 47h

Balance staff U1540 / U3094
balance with/without screws
Stem W1260 / W3037
thread 0.9 / 1.2mm
Mainspring Zf1404, 1.70 x 11.5 x 0.13 x 360mm
Hands 1.50 x 0.90 / 0.21mm
Remarks so called Wehrmachtswerk (army movement) differences unknown between 6310...6318 likely just designations for varying bridge shapes
family/generations: 18000 A/h: 6310..6318: - 6410..6412, 6417: date 6415, 6416: day, date suffix N: modified balance and stem mechanism 21600 A/h: 6325, 6326: - 6425, 6426: date 6428 : day, date 21600 A/h, redesign: 6376: - 6380: date 6388: day, date, no second