Nice. I don't know of any 13s here but there are some ITT/AE Model 25s, in MV and HPS. I really like those, I kind of forgot to mention them, because I figured they aren't quite as old as OV-15s and 15-000s.
LG's #1 North American light fixture identifier**If anyone wants to learn more about any company or product you've never heard of before, do please leave a comment saying so on one of my gallery pictures or by PM, and I'd be happy to give a thorough explanation.**