Quote Originally Posted by c_amos
The boat pictured, (the picture of which I got from the E-Bay add) is an Ariel.

(longer cabin, large windows)
If your question is 'would that HULL number make it a Commander' then this quote from Bill should answer it;

Ariels and Commanders are numbered serially as are all production yachts. The Ariel is numbered from 1 to 440. The Commander is numbered from 1 to somewhere around 370. (The highest numbered Commander we have identified is 337.) Ariel production began in 1962 and ended in 1966 or 1967. The Commander was produced beginning about a year after the Ariel and its production is believed to have ended in the same year as the Ariel.