Viking card-edge connector part number schema (crazy vintage)

[Cthulhoid]

I was trying to find HP part number 1251-2314, a 2x10 0.1" female card-edge connector, for my (possibly in(s)ane) attempt to add a USB port to a 5300A/5304A frequency counter. This part is equivalent to Viking 2VH10/1JV5(079). I wasn't able to find a Viking catalogue online and haven't been able to get to a good university library yet to search in person, but based on all the sites spamming Google with a US DOD logistics databse, I could identify the individual components—2 VH 10/1 JV 5 (079).

So 2 rows, vertical, through-hole?, 10 positions. Maybe "1" is 0.1 inch. Does anyone know what the other numbers signify? I ended up ordering a Sullins EBC10DCWN, which was a perfect fit (although obviously doesn't latch into the receptacle surrounding the male connector on the mainframe).