Hmm, Programmed Test Sources does not seem to mention anything but BNC outputs in the materials available online (and SMA on some of the higher model numbers). Actually, the mounting holes shown in your photograph may be intended for BNC connectors originally. The extra opening visible above the rectangular connector looks just like the flat top of a D-shaped hole for a BNC. Maybe someone retrofitted those connectors, and you can easily revert to BNC?
EDIT: For just 70 bucks, I would take the plunge!
Yes, there's no way to tell whether it's a factory option or a user retrofit. And yes, the $70 price is attractive. However, consider the following:
1. An experienced seller of test equipment with a 100% rating
2. who prices the unit suspiciously low
3. and ignores a question about the unit's apparently unknown connectors
4. and don't forget about shipping and customs which doubles the price - literally!
5. For an untested unit.
Nope. Too many red flags for me. Maybe it's a trivial retrofit, maybe not. I've found that when dealing with ebay, a little paranoia isn't a bad thing!
Ed