$2,500-$4,500
Without seeing it a value is a guestimate, but the 20ga adds considerably to the market value. Is it a 20ga 76mm chambered gun? A more modern type gun in good condition will be right at $4,500. Being a 30-06 also adds a good chunk. The 20 gauge was built on the 16gauge frame.
Some sellers will try to get well over this price, but I would never pay more. There's a "languish point", and it's $4,500.00. Few drillings sell for more. They sit on the market for years often. Many drillings are worth more, but they just don't sell.
The scope is also a wide variable. Nickel scopes are dated a bit and were mid-grade scopes; they are good scopes but not a plus.
Thanks for the reply, I was hoping to hear from you. You have told me what I wanted to hear and what I pretty much expected, but I’m not well-informed enough on the market dynamics of these things to have any measure of confidence in my own judgment. I figured the 20 gauge might be an advantage (although I, personally would prefer 16), .30-06 as well (although I’d prefer.22HP). They’re asking considerably more than $4500. I’ll let it age for a while. I didn’t handle it, but looking at it in the glass case it would appear be in almost unused condition. Also, looked light and svelte enough to be usable (unlike many drillings.)
Thanks again.