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Old September 26, 2008, 02:18 PM   #465
Mike Irwin
Join Date: April 13, 2000
Location: Northern Virginia
Posts: 39,153
OK, BNP. British Nitro Proof, so it was definitely in Britain.

I THINK the SP stands for Special Proof... Hum... maybe not. Something I just found on line says that SP was used until 1925 and was a voluntary black powder proof. I don't know why it would have been used on a gun made well after WW II, unless it's because the .38 Spl. was once available with black powder loads...

The other ones I'm not familiar with.
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