I happened on a thread on damascus bbls on the shotgunworld forum and of course got sucked into the fray. Lots of good info there, some of which I'd guess came from members here. Below is a link to an incredible vintage youtube video that is very worth a watch if you haven't already seen it. Shows the making of damascus back in the day. Amazing they actually made a movie of it back then and that it survived to be digitized. I apologize if this is old news to some but this is really good.
https://www.youtube.com/watch?v=fa9dlvRDuQU