Sears Roebuck full deluxe sporters
My take on the OP's situation? Keep it and enjoy it!
1903A3 original pics below sold by me some years ago for $990
British 303 deluxe sporter was (and still is) a $300 rifle, and came with 200 rounds of modern ammo.
The British sporter was a Sears & Roebuck 1962, full deluxe sporter that sold for $48.00 then (plus $2.50 S&H & tax). Note that the 30-06 Springfield full deluxe sporter sold for $68.88. The British sporter came with Williams peep, parkerized, cut and re-crowned barrel, ramp front sight, Fagen Monte Carlo stock, and a Williams quality leather sling & swivels.
For me at that tender young age, it was the best all around upstate New York (scopes no good...now or then in my opinion)deer gun that money could buy (at least my meager money) and a better "value" at $20.00 cheaper than the 03 sporter.
Gathered a bunch of white tails in those days....glad to still have it even though replaced by a Winchester 30-30 lever gun years later.
Probably could not get even $300 for it these days.