You mentioned it was a black M4 series....could it be the M4-2 or M4-P? I think those are the 2 that were Midland manufactured, not the original M4. If that's the case, even $1250 is dodgey as I've seen those go for much much less (like $400-800 less). If it's an original black paint M4 (not just a black painted chrome one) then yes, you're looking at $1300-$5000 in value based on it's condition. I'd jump on it and sell it and get a couple "normal" Leica M bodies, but if it's the M4-2 or M4-P, I'd bid low ($600) or skip it all together.