This is a new Morse Silent Chain with connecting link.
SPECIFICATIONS
Chain Construction side Guide,
Chain Overall Width 0.875" over pins
Width between guides is 0.677"
Chain Type Standard, Standard
Material Steel, Steel
Overall Length 36" Closed loop.
Pitch 0.375"
Product Type Silent Chain
It is hard to find good info to identify this chain, I'm not 100% sure that this is SC chain. The tooth profile is not quite the same as a Ramsey Brand chain although I think it should still run on the same sprockets.