Scope Mount Base *Left Side Only* For Remington 870 12 Gauge shotgun, Solid Aluminum base (6 oz)  w/ 2 bolts and 2 nuts.
I purchased this ONE/LEFT SIDE very sturdy/thick aluminum scope mount in the late 80's and I used it with a

Bushnell 1.5-4 x 32 mm scope and weaver mounts on my Remington 870 Wingmaster shotgun for many years. Later I changed the original bolts with longer bolts and added two nuts for extra tightness (please see images). 

The parts are in good/solid condition, the threads inside the base are fine and bolts and nuts are working fine.
The house is pet-free and smoke-free for over 20 years.