Аccording to the specifications of the famous site " RANFFT WATCHES - Pink Pages for Timepieces "
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
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