1917 BSA with"Z" serial number prefix

[pcaru1]

I need some info on a "Z" prefix serial number BSA. Any info on this would be appreciated. I can supply more pics if needed. It has a new fore stock and the original serial number has been overstruck. Hard to see from my pic but the old serial has an "H" prefix. Good bore with some darkness in the grooves. I'm hoping "Z" doesn't mean beyond repair.

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