Hmm...I dunno Mikey.....marching drums aren't worth a whole lot, unfortunately. That one is one of the lower line drums of its time, still excellent build quality, just not as high end, as say, a seperate tension Dynasonic marching snare (yes they did make them). Having bought and sold a couple of vintage marching snares in the past, I'd estimate around $80, even with it's (probably now) one of a kind school colors on it. I had a Leedy & Ludwig marching snare that I sold last year and it went for $125, and those are pretty rare. Also, the 1920's Ludwig & Ludwig single tension snare I restored last year, went for $100 recently. Both were nicely restored rare examples, but again, being marching snares, the value is trumped by standard kit snare drums.
Good luck on your sale. flower