Thanks for the reply.
Apparently my Google-Fu is most strong; I did a search on 'vertical cabinet hinge' and scrolled through 50 or so images and found a similar hinge.
From there, I determined they were OEM on older Monaco coaches and found a couple of online RV dealers that carried the hinges. No one had the polished brass, so I had to settle for antique brass.
Ordered them yesterday from Dyers RV Parts in AZ and got them today!
Hope someone else can benefit from this...