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Camillus used the two piece can opener from 1946 through 1948.
To support what leghog has noted, the can opener is the one used on the 1946 Boy Scouts of America "Scout" pattern knife. Change the shield and its the same knife.


Government specifications switched to the one piece safety can opener in 1944. With the war and government procurement the Patent didn't matter, all makers could use that pattern. When the war ended and commercial production again resumed they had to revert back to the old styles until the Patent expired or they licensed it from Imperial.
The main point being that during the war, government procurement switched to the safety can opener in 1944 and used it in all the knives regardless of who the manufacturer was.
All the best
Frank Trzaska
I would say the information on markings is in error.
The BSA Scout with the two-piece opener is pictured in Boys' Life:
in August, 1946, at p. 27;
in September, 1946, at p. 27;
in December, 1946, at p. 20;
in May, 1947, at p. 2;
in June, 1947, at p. 37;
in December, 1947, at p. 31;
in May, 1948 at p. 29.
This is not a complete list.
If the knife was manufactured in the 60's or later, there's no way it would have a two piece can opener.

I have a knife identical to the OP's with that same tang stamp but with no underscore.