Yep, that's it..a Bargman H-20! We had the original handle part when we got our trailer, but the bezel was broken. We found a couple of partial assemblies on eBay and bought them for parts. We sent out the handles & bezels to be re-chromed and then used the parts & pieces to rebuild complete latches. Between the three partial sets, we ended up with two complete - one on the trailer and one as a back-up plus a few miscellaneous "extra" pieces for the guts.
Rebuilding Birdy's Door
Keep an eye out, you will find one or bits to assemble one with patience. As mentioned earlier, one of the best places to get these "unobtainium" parts is at a vintage rally.