Any recommendations on a 72 bass accordion on a budget?

[shutha]

i have a ~600$ budget and im getting into accordion and im ordoring off the internet is there any reccomendations on what and what not to be looking for please and thanks

 

[Soulsaver]

Have a look here.. top info, even if I do say so... :
http://www.accordionists.co.uk/viewtopic.php?f=3&t=1404