Winchester 94 value
A local pawn shop has a 1971-ish 1894 in 30-30 for $500.00. Since it has a B-Square side scope mount on it, with the attending holes in the receiver, I told them "no way". They came down to $400.00 instantly, but I'm still not certain it's worth even that. I'm left-handed, and wouldn't be able to use the scope anyway. Beside, scopes on 94 Winchesters are a specifically listed sin. What would the old girl be worth? I'm thinking #350.00 would be most generous on my part.
Winchester 94 scope mounting
IIRC, the B-Square uses existing screw holes in the receiver; the two receiver sight holes and the large headed screw that is really just a cover for the lever link pin. I put a scope mount on a Sears 101 (a rebranded 94), and didn't have drill any new holes in the receiver. $400.00 is about right these days. I traded a 70's era 94 for a S&W 14 a couple of years ago and the Smith is a $400-$450 gun.
This one has 4 holes drilled in a straight line
This one has 4 holes drilled in a straight line in the receiver. I've seen the one that you're describing, but this is definitely not the same mount.
This one has 4 holes drilled in a straight line
I would say $225 to $250, tops, for a post-64 with 4 extra holes in the receiver. Around here, anyway.
This one has 4 holes drilled in a straight line
by Hobie 
, Shenandoah Valley of Virginia, Saturday, December 31, 2011, 19:07 (4710 days ago) @ edwardyoung
I would not pay more than $200 but I'm called "cheap" and overly critical. The boss has had one for a year just like the one you describe. He wants $350 for it. Still has it.
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Sincerely,
Hobie