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Fig. 1

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Fig. 2

Tissot 27

manual wind
sub second

12''', Dm= 26.5mm, Do= 27.0mm
H= 4.05mm
F= 0.6mm
T= 1.6mm
15 jewels
f = 18000 A/h
power reserve 43h

Balance staff U619

Stem W619

Mainspring / battery
Zf877, 1.30 x 10.5 x 0.12 x 320mm

1.40 x 0.65 / 0.18mm

Comments about the data

minor modifications during manufacturing periode (cf. Tissot 27-3)

baseplate plane:
27 : sub second
27-1 : sub second, Incabloc
27-3 : sub second, Shock Resist
27-2: sweep second
27-23 : sweep second, Shock Resist
27-53: chronograph 60s, Shock Resist
27-63: sub second, date, Shock Resist
baseplate bevelled, setting-lever spring modified:
27-T : sub second
27-1T: sub second, Incabloc
27-2T: sweep second
27-21T: sweep second, Incabloc
27-61T: sub second, date, Incabloc
complete redesign:
27B : sub second
27B-1 : sub second, Incabloc
27B-2 : sweep second
27B-21: sweep second, Incabloc
27B-61: sweep second, date, Incabloc
27B-9: no second

Example, year: signature; shock device
1939: 1004783, Tissot

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