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Tissot Bumper automatic 1946
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Tissot bumper automatic 1946
Calibre : 31.1
Movement : 1730660
Case ref : 6540 - 2
BhP. 19800
The first bumper automatic calibre 28.1 was
made together with Omega + Tissot + Lemania ( SSIH )
Societe Suisse Industrie Horlogere .
Followed by the calibre 28.5 .
The improvement was calibre 31.1 introduced in 1944
and was also made by SSIH.( Omega + Tissot + Lemania).
