I talked to the owner again via phone, and he confirmed that it was indeed a nine-twelve (912). I'm going to look at the bike in about 4-5 hours, is there anything in particular I need to pay attention to while looking the bike over. The owner said that the frame is in really good shape, althouh there is slight surface rust in some of the joints (but he claims that it's very superficial).

So is there anything I should look out for in particular?