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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Hamilton 620 (Buren 1005)

sweep second

12.5''', Dm= 28.15mm, Do= 28.5mm
H= 4.2mm
F= 1.5mm
T= 1.9mm
17 jewels
f = 18000 A/h
power reserve 42h

Balance staff U2490

Stem W2403

Mainspring / battery
1.00 x 9.5 x 0.095mm

1.50 x 0.90 x 0.22mm

Comments about the data

first movement family with micro rotor
selfwinding gear with direction switching by a pinion floating between two huge jewels (Fig.4)
in 17-jewels variants one of these jewels substituted by polished steel disc

663, 666: second with friction spring
619: second with double third wheel, date
620: second with double third wheel
Hamilton designations of other Buren calibres will be added, as soon as they become known.

Example, year: signature; shock device
ca. 1960: HYL, BAA, 1005, Hamilton Watch Co., 620, Swiss, 17 Jewels; Incabloc

Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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