Need a bit of assistance

I recently bought a pocket watch. I can see that it has a Chester hallmark but I’m having trouble reading the date mark. Also not sure what the numbers 407 and 5 signify. Thanks

This date letter B is 1902. The numbers have no particular significance; watch cases normally have the watch movement number stamped on them but 407 doesn’t seem like a big enough number for that.


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Thanks so much, I was so unsure as to whether it was a B or R.