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Face of top ring looks a lot like this old TRW ad

Picture of oil ring if that helps to determine manufacturer.

I’m showing the ring faces.

Both rings have an inner bevel as installed upwards in both lands.

Inner bevel is the same as M, PL and HC

Ring surfaces appear to be flat and the moly is shown...

Pistons are Wiseco forged flat tops.

Ring pack is 1/16”, 1/16”, 3/16”

The rings are unique to me as follows

Ring installed in top, I’m not going to call it the top ring as I don’t know for...

I’m building another small journal 327 and have come to a spot where I need some help.

I bought a set of Wiseco forged flat top pistons from a gent that couldn’t use them as his build had to go...