Hello,
This is an Excelsior Accordion. These are the absolute finest accordions ever made... 
This Particular Accordion is an amazing instrument. This has 10 treble changes, a master switch.
and 7 Bass side switches...  This is also, a DOUBLE TONE CHAMBER..  Please see the pictures...
The accordion also has a full microphone set up, with all controls.. treble , bass.. etc....The accordion was tested and works...  This does hold air..  the keys function at the treble and bass
sections..  all the reeds are intact. and in place as they should be and all looks original...IMPORTANT SECTION TO READ....   DISCLAIMER!!!!!!!I am not an expert. I do not play accordion....  This is sold as is, with no Warranty implied.... No Refunds and no partial refunds...  I have great status and intend on keeping that..  This accordion has wear and tear.. scratching, the grill has dents. There is tape on the bellows...
I think a key has a hairline crack...  but, all said and done. The reeds look good, but might need tuning....Please take this into consideration...  These are amazing accordions but this might need some work..
That is your responsibility . Period  ....   Look a the pics and make your best observation concerning the condition.
As I said before, I am not an expert....   Thanks and all the best....This comes with a case in good condition....straps also included...  Shipping, the shipping will be 50.00 in USA...
West Coast, CA, NV, FL, TX, WA all add 40.00 dollars..
International shipping will be 155.00
Thanks and all the best.....  These accordions are priced at 3000.00 to 5000.00
good luck....