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The SN's were used over & over, as the years went by, with varying suffix's - why the bbl markings are the only way to date those rifles.
AFAIK, You most likely have a Stutzen ( "S" ), made in 1917 (Wn*17).
Here's a database thread:
http://forums.gunboards.com/showthre...my-Mannlichers
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