Russ,
Someone with the SN look-up data should be able to confirm but to my eye it appears to be a later Carleton.... odd that the length isn't showing on the stem? perhaps the photo cut it off. Are the thwarts secured with diamond head bolts?
For the price it looks to be in reasonable condition...if you have an interest in it you may want to grab it right away now that it's been advertised here
Mike