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Why do you think it's not a 51? To me it looks very much like the 51 shown in Roland's pages.

Keep in mind what Roland states about the assembly of these movements: older materials were used up, new materials were phased in. Transition times between movements of the same family were long and it is quite normal that you see slight differences between early and late movements of the same calibre number.

Regards
Tomcat
 
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