Doubt it with the condition and mostly that cut trigger frame is going to hurt you
$60-75 ish. You may get more if you part it out, but that takes time.
Most fields won't let you play without a trigger guard. I bought 2 classic mags recently. Both of them were pretty good deals. One was $50 the other $80 both came with at least one barrel and only needed new seals to work. I've seen valves assemblies going for around $50-60 on ebay and bodies going for around $20-30. If you have the time, parting it out might get you more money.
I gotta agree with $60 - 75. Looks to be in rough shape and no barrel.