Kaleb, I think you are right about Camillus being the maker.
The only sure way I know to tell if Schrade made it is to look for the Swinden System.
I don't know of a 100% sure way without taking the knife apart, unless you can see a pin in the bolsters, then you can be assured that it MAY not be a Schrade.
According to LT, Dave Swinden said Schrade was the only company that ever put his system to use. Phil Gibbs (formerly with Camillus now with Russell) told me in BF that Camillus NEVER used the Swinden key system.
Therefore, if it is Swinden System Schrade definitely made it, But since Schrade also made non-Swinden knives, it could be Schrade made.
That said, I think all the OT & UH knives that Schrade made, were made with the System, especially after the Schrade-Walden days.
So, if you can see a pin through the bolster, it is probable (IMO) that Camillus made it.
I have seen a 61OT, post-Walden, that was made with pin-through –bolster construction. I was later able to confirm through Camillus S-cards from Tom Williams that Camillus did indeed made some 61OTs for Schrade.
Camillus also made a lot of parts for Schrade that Schrade then assembled. This was verified by Tom.
Dale