Marked "B.R." According to an old Shooters Bible, this fits Remington Models 552. 572, 740, 742, and 760. I suggest you confirm this with other sources if interested in the sight. A footnote in the SB says a raised line of sight was used on 740's and 760's above certain serial numbers, which might mean you would have to use a front sight of different height than what you have now.
Machined steel. excellent condition. No screws. $50 shipped in the USA. Pay with Postal Service MO. No foreign sales.
Indicate interest with post here, follow up with PM. Thanks