the later version read bassman "70" on the faceplate. i have had two "tens". the speakers can be a bit of a problem sometimes, sometimes not. i never cared for them having blew a few on my first one. the sound was always good but i over drove the speakers trying to get too much volume out of the amp.
i now have a "ten" head in a Bandmster/Reverb head cab (that is in fact a bolt in operation) and am glad i have it. there is more room in the reverb cab, i don't whang my tubes when i toss in the cord and it runs a bit cooler with the extra room. it does well driving my blonde 2/12 cab with Marshall speakers. i don't try to get the volume out of it now like i did in '73 with my first one. for more volume i am working on building a tone ring 15" cab i will drive with what is going to amount to a 200S Sunn built in a AB165 head used in conjunction with the "ten", splitting the signal to both. any more volume needed past what my setup can deliver then it can be miked as far as i am concerned.
guitards like tens. they are basically a 2-6L6GC amp with Fenders version of a Bauxandall preamp and will RMS 50 watts and peak around 100. Fender used a pissy inline filter choke in the ten and i have always thought that a larger value "real" choke would do well but i have never researched making that change to a ten circuit. i use the bass channel almost always with no effects added.
400 is a fair price, if the speakers are originals in good shape i would ask 500. if it is minty then set your price high. it is always easier to lower your price than it is to raise it.
my head cab... i have 385$ in it as pictured.