Similar to what Steve just mentioned, I have a G box and the note are at least an octive above the G scale on my C box.
It is not a Cajun accordion and only has two reed banks. It is old and of Chech manufacture. I suspect it was use for traditiojnal Eastern Europian music or perhaps Irish jigs and hornpipes.
It was an "I will trade some of my junk for some of your junk" swap and should make an interesting restoration project someday.