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I don’t play tenor banjo but that looks like a very good buy for someone. Does it have a tone ring? You could try to get Michael Holmes (not the bouzouki player) to identify it.
Check your email
Yes, it does have a tone ring (a round one, not something fancy like a tubaphone type ring).
-Brett
Well, that’s OK. A tubaphone ring might make it somewhat louder-I don’t know-but tenor banjos don’t generally need to be made louder. Still looks like a great buy. It has a 3-piece neck. The neck looks just like my Fairbanks Whyte Laydie. I wish I could see the peghead more clearly.
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I have a vintage american made washburn tenor very similar to yours. Plays a treat, would take a kings ransom to seperate it from my greasy mitts!! Enjoy it!! 
Brett, my 1927 Slingerland May Bell tenor looks almost identical to your instrument in every detail. Except mine has a resonator with a floral decal. I’ll post a pic if I get a chance.
I agree, the peghead shape, the stretcher band and the bird’s eye maple veneer on the outside of the rim…all screams of Slingerland Maybell. It might have been made by them for some studio or other brand, so the standard markings are missing.
My opinion - these are great banjos and often overlooked. Most sound great to me, both as tenors and as converted 5-string frailing banjos.
There’s lots of notes still in that baby that need to come out. Enjoy.