Any idea of year or Calibre please!?

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Hi all. Another purchase recently I couldn’t turn down. Problem being I have no idea how to remove the back case and I don’t wish to try, so I can’t get any information! Does anyone know please a rough year or possibly the calibre this model uses!?? Thank you in advance.
 
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Hi
My guess would be something like a cal 503, maybe a 2849?
Regards
Chris
 
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Thank you very much Chris. I’ll dig deep online see if I can find a match!
 
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I think I may have whittled it down to a mid 60s cal 562!!