Hi. Ive come across a couple of martini enfields recently and am seriously considering buying one, but i dont understand the serial number locations

All of them have the rear sight numbered to the barrel, but all have different (read vic government) stampings on the buttstock and a different serial number. Is this normal for colonial martini enfields?

Also, were the breech blocks numbered as well?

I have wondered if the number on the buttstock is a rack number for the vic gov and not actually a production serial number

Thanks
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