Those are Raytheons for sure. A very unique plate structure. They should have the Raytheon mfg code of 280 on the base. In a tube test I rated the clean just below RCA, Sylvania and Ken Rad. Sweet but a little stiff. Probably a great tube if you drive it loud and hard.
The test makes sense because the plate is so massive. If you don't like spongy tone these would be a good choice. Probably would take a lot of effects very well.