Most of the Mauser side plates were numbered as Ron described. If your gun serial is 9507x then the inside plate number would be "96" and the outside "07".
For a brief time, in the 1930s, the inside number matched the first two digits of the serial number.
Not sure if any other manufacturers did this.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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