It's a rather pretty instrument from the 1930s-40s. Unfortunately looks can be deceiving, and it ultimately isn't likely to be a great instrument. It will have been built in a factory probably in Klingenthal, Saxony, but maybe somewhere else (definitely either in Eastern Germany or somewhere in Eastern Europe). You can tell it's a Klingenthal-esque box because from the general design. Looking up 'Saxony Accordion' on Google Images will yield similar results. Mostly, these accordions were cheaply mass produced and the low-grade materials used haven't aged well. They tend to have very little value if damaged, and slightly more if working.
Not all of them are as terrible as I'm making out, though! Some were fitted with really rather nice reeds made by Dix (You can tell if reeds are Dix because they have a circle stamped into the reedplate) and the reeds are worth something even if the accordion isn't. However, nice reeds often come in a nice accordion, so if it does have Dix reeds then it's likely that the rest of the instrument is a bit better than usual. Also, the Klingenthal factories also built rather decent large instruments, often with multiple palm couplers and four sets of reeds, and these seem to be really rather good, at least by pre-WWII standards.
Anyway, to cut a long story short, you have a pretty low value but probably useable instrument. If the bellows aren't too leaky and the keys/buttons all play and don't stick, then it could make quite a decent instrument to learn on/mess about with. And if you damage it then it's not going to be like you've damaged a valuable or rare instrument. Even a mediocre accordion is better than no accordion at all!