Well, like I said, Gun Broker completed auctions seem to place the value on a mechanically near perfect example like this at just under $500. This one doesn't have its original grips so there would be a bit of a value deduct for that.
Though given its approximate date of manufacture (1972) I'm wondering if it could have shipped with non-numbered magnas?

With transfer and all I'd be into it for around $435.

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