This is a 2 piece base, and rings. They were on this 308 W.mdel 70 Stealth HB rifle, with a 50 mm objective scope and 1" tube. I do not know the brand, but possibly they are a redfield or bushnell (if the latter make rings/bases, as it was on a bushnell 3200 which I sold).
They are in excellent shape, with screws.
$20 shipped OBO.
Here is a photo.
checks, mo., paypal plus 2.9%, or trades ( beretta 92 FS 9 mm mags )
A leupold dealer removed these while I was at lunch to install a long range base and different rings, and he lost the light aluminum 'washer' that goes inside the ring... if you use that on your scope mounting ... one one of the rings... otherwise excellent.