Vintage Speedy Caseback Stamping?

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Hi all, this watch was a gift from my grandfather from a few years ago. I was not sure if it was a 861 or 321 model so I took the caseback off to confirm. Upon doing so I noticed a “4.8” stamp and a “GB” stamp, does anyone have any idea what these might be referencing? Thanks!

 
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I can't comment on '4.8' and 'GB' but be careful when you put the caseback back on the remains of the gasket falling into the watch could affect the movement!

If you like show us the rest of the watch!
 
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I can't comment on '4.8' and 'GB' but be careful when you put the caseback back on the remains of the gasket falling into the watch could affect the movement!

If you like show us the rest of the watch!
Good tip, I noticed the gasket debris too so I didn’t actually get a look at the movement but just left the dust shield thing in place and reinstalled the caseback.

Here’s a dial view:

 
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That's a nice looking watch, congrats!
Well preserved DON bezel 👍