tube chamber was really a marketing thing but fun !
i will never understand these kinds of questions,
but here are my answers:
it is a very old accordion
it is a very nice accordion
the reeds look very nice indeed
it probably plays like a dream
what difference, after all these decades, do fine specific details matter?
it's not like you need a part to match something
or think it is under warranty still and have an issue
clearly these are not need to know things because you already bought it !
am just havin' fun with you... enjoy the squeeze