One of the other '61 guys here in Minneapolis has a Bonneville convertible in the same color combination - it's trim #253, or #283 if the car has bucket seats. You can't really see the interior but this is the car:
http://www.retro.net/db/1961_Pontiac...rtible/1273/1/ (this photo is from the POCI national meet in 2001, as it happens my car is parked next to it.) I don't recall if it has blue armrests on the doors like the one in the auction, though. For that matter, now that I look at it more closely I wonder if the seats in the auction car have been recovered...the texture doesn't look quite right for OEM leather.