351 bumper?

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Hi All,

Can someone confirm this is a 351 movement? Thanks in advance for the help!
 
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No I don't think that is a 351, it's likely the 351's predecessor with the open return springs, those on the 351 are hidden. It could be a 28.10RA SC PC but it could also be the sub second version the 28.10RA PC. In essence, it is what became known as the 340 or 350, same but different!