1.1 inch U.S. Navy shell marking

Today I acquired a 1.1 inch Navy anti-aircraft shell with the following markings:

B O
1942-6
lot no 754
1"10 MK I
75 CAL
U anchor S wn Can anybody tell me anything about this shell? Who made it?

From AMMUNITION FOR U. S. NAVY ANTI-AIRCRAFT MACHINE GUNS, SYNOPSIS OF DEVELOPMENTS DURING WORLD WAR II AND SUGGESTED FIELDS FOR FURTHER
IMPROVEMENTS. U.S. NAVAL PROVING GROUND DAHLGREN, VIRGINIA 1946

Ordnance Pamphlet NO. 4, AMMUNITION Instructions For The Naval Service, May 1943

Tom,

I don’t know the manufacturer.

Brian

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Thank you Brian!

Please, can you post a picture of the headstamp?

Not that great of a picture. Just would like to know who manufactured it. The bottom of the shell is stamped B O Any idea? Thanks Tom

Tom, thanks a lot for the picture. It is a poorly headstamped “B. B. CO.”, so the manufacturer is Bridgeport Brass Company, Bridgeport, Conn.

Regards,

Fede

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Thanks for the answer to my question Fede. Knew someone from the IAA Forum could help me!!! Tom

Here’s a link to the first document Brian posted above (AMMUNITION FOR U. S. NAVY ANTI-AIRCRAFT MACHINE GUNS, SYNOPSIS OF DEVELOPMENTS DURING WORLD WAR II AND SUGGESTED FIELDS FOR FURTHER IMPROVEMENTS. U.S. NAVAL PROVING GROUND DAHLGREN, VIRGINIA 1946):

And a link to OP4:

Brian, thanks for your post. I wasn’t aware of the first document until now.

Thank You Larry!!!