Weltmeister Achat 72 bass.  As new condition, less than half new price.
 
This mid size accordion was built in the German town of Klingenthal by the well known Weltmeister factory. With 72 bass buttons and 34 treble keys, this compact and lightweight accordion would be ideal for players who are looking an accordion that isn’t too heavy in terms of weight, still want a good quality sound. The Weltmeister Achat 72 Bass Accordion is tuned to a bright three voice tremolo, and features a powerful bass tone, making it ideal for most styles of playing.
 
Listen to this accordion on Youtube
https://www.youtube.com/watch?v=P_5g_gZBRAo