I'm new here and found this board while looking for more information about a GPSDO I bought on eBay. Mine has the Trimble board and OCXO, so I guess it's a variant of "2015-07-17". It's sold by eBay user "amoj1010" and the interface board has the seller ID marked on it. It's a nice box, with two DB9 serial ports -- one shows the UCCM command interface, and the other reports binary location data. I'm attaching some pictures from the eBay listing.
Also, I apologize if this is old news, but I discovered that the commercial software GPSCon Pro can monitor these units! It's not cheap ($77.67) but it works well, and it beats typing in commands at the "UCCM" prompt and deciphering the results. Also attached is a screenshot from GPSCon monitoring my box.