tried copying the link but am too dumb. BIN is 15k, but not one ya see everyday.
That one looks like it could be a 1951 Hudson Sporting Goods barrel cleanup gun.
I'd go on a "road trip" with that guy in a minute. Don't even know him!
I will add that I would personally have those than #1 and 2. Better value, transition (7.65mm), and chambering rarity.
I believe one of the gun heads here on the fire spotted a Winchester M54 in 7.65X53MM several years ago