Hi Timo!
Great looking 3610.
Lemania was relatively early with a full rotor automatic.
With the exception of their prototype automatic CH27 chronograph from the late 1940s, they actually never made a “bumper” automatic.
The 36xx evolved from the 3600 (1951), to the 3610(1958 - improved rotor design). They also made a date version of the 3610, the 3615.
The 36xx family is, as you have observed, directly derived from the cal 30xx. Which again was derived from the S27. The common ancestor also to the cal CH27 / “Omega 321”.
Date parts for instance, are shared between caliber 3015, 3065 and 3615. The first two hand wound cal 30xx. The latter automatic.
Cheers!
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