Looking over the cabinet hardware after installing the reassembled cupboard doors, I found the latch hardware was pitted with peeling chrome.  Unfortunately the material appears to be chrome on zinc, not brass, so there isn’t much hope for restoring it to any kind of shape. I did a fair amount of internet research and determined that the latches are manufactured by Perko and this is the 3/8″ offset version because the catch mounts on the frame of the cabinet carcass, which is a fraction of an inch below the non-flush door.

Pricing varied pretty widely but I did locate a place that had them at just under $20 a set.  This was just before West Marine changed its price matching policy, so I was still able to get them to order up a dozen for me.  Seven were available immediately and I had to wait about ten days to get the balance.