Old structure foundation question

How long has CMU been in use ?
Found rough face like split block type at a 1920’s build and suspect CMU at a 1880’s build.

The rough face had me thinking stone block till I saw it cut in half for an addition.

I’ve seen CMU style block in houses dating to the 20’s. My understanding is that the older block (around here) it is cinder block, and not actual concrete block. I’m not sure of the dates when they started to switch to actual concrete block.