20-30 bucks.

the paint is in similar shape. The crank and BB are off. to be honest (as I noted above) some kid who is doing a SS/FG won't cotton much to the 'barbell' heavy cottered cranks (plus the chain ring is near impossible to mod down to a single). And the Derailleurs are gone to, so it's just a frame with handle bars and seat, seat post... the Simplex changers are more of a curiosity of the time ( I rode a few bikes with Simplex changers and had a few that busted on tour)

So I'd guess your bike, with all the extra parts, is worth about...

20-30 bucks
best of luck!