You've just convinced me to take the Remington 721/.270 Win out this fall hunting. It has the same Lyman Alaskan/Stith Streamline mount as your rifle!
I have never seen a 721 with Stith mounts before! My 721 300 H&H is my usual "Go To" rifle but I wanted to shoot a decent buck with a vintage Model 70. I planned on using it for Bear this Fall but they never showed up. The 53 FW in 308 and a receiver sight is the next one to go into the woods.
Thanks for all the great photo art of nice Win rifles! Always appreciated! Re Stith mounts. I have a couple of Model 70 rifles vintage 1942, both with Stith similar mounts accommodating an early Weaver, believe Model 44o (?) scope and the other a very Lyman Alaskan one. As above I'm unaware of any production of Stith mounts postwar made "for" the Remington 721. It wasn't introduced until 1948 and the Stith by then would have been substantially outdated by its design inability to accommodate forward scope "bells" as describing the larger "objective end of the lens. The mounts were large, heavy and clunky. They were 'era-great', as preserving many rifles from being "desecrated" with scope holes in era "non-factory".
My 'net', the Stith are great with an appropriate era rifle such as those early Model 70 editions or my Savage Model "H" Carbine with its Stiths achieving the same purpose. Beyond, they're "artifacts" of aptly inferred, of 'another era'.
I have a latter thirties era "Big black dial" as they're termed, Zenith Radio, working. I haven't fired it up for a few years now but when I do, the lights practically dim and I feature my electric meter spinning off it axis! The old stuff (me included) as 'great', but artifacts!