Hello Mickael
The Hohner is pretty low quality. I'm selling my Jackie English concertina. I can sell it to you for 200 Euros. It is in perfect ás new' condition. It has a great reputation as a starter concertina. I'm selling with a view to upgrading to a vintage concertina. Here is the 'Jackie'website http://www.concertinaconnection.com/jackie-jack.htm
Best wishes
Donald