Which generation are you referring to? Colt has made several runs in the past, oh, 30 years of Single Action Army revolvers on the so-called "blackpowder frame." The 2nd gen guns were all Centennial Peacemakers; 2002 were made IIRC. 3rd gen guns were made as well, though I don't know how many, and .44-40 Frontier Six Shooters are back in production (or were, recently) on the old frame style. So in answer to your question, yes, Colt has made many SAA's with the blackpowder frame since the official "transition" in 1896. I have 1st Gen SAA with the then-new spring loaded cross pin, and I am aware of at least one example with a "later" serial number that has the old-style transverse blackpowder retaining screw. I'm not sure that revolvers of that era were always assembled sequentially, however. I suspect not.
Anyway, hope this helps.
vanfunk