I've actually seen one of these sell for around $1500 -or maybe less - in really nice shape. It was estimated to be a 1960's model, if I recall correctly. Make sure you play it and like it before you buy.
I have a beautiful Pierret alto sax, serial number 14807.
How can I determine its age?
I played it in the Seattle Symphony and it is a fine classical instrument.
Regards
David Taylor