Is this a 69 DT1 cylinder?  


 

Quite possibly . The top three fins have been trimmed , presumably to accommodate an expansion chamber , possibly a GYT pipe .
I think I saw this on Ebay . If it came with a brown / red insulator block on the intake side , it will be a 69 , though it might have been ported .

Appreciate you looking this over. The pic I posted is not that particular ebay cylinder, though they do look alike.

I was having some problems w/engine performance and wondering if maybe the cylinder on the engine could be an issue after noticing the 2nd cylinder looked slightly different (the one above). Both came with the bike when I bought it. The one on the bike shown below.

pics of cylinder/head currently on engine: