Paul,
I believe that this question was inspired by a request for advice by a new member. Arianna specifically asked me about the size of instrument she should buy. I took into account the fact that she is brand new to the accordion, and physically petite.
My advice was (and still is) that she should try a few different sizes, though I ventured an opinion that a 72/34 may be the most appropriate instrument for a smaller person to learn on.
The logic I applied to Arianna's original question was based on the information I had before me, together with my own experience of 72 Bass instruments. I tend not to give specific advice unless I am asked to do so, which, on this occasion, I was.
Happy Girl responded by casting doubt on my advice, stating that a 120/41 would be more appropriate. She went on to suggest that Arianna should wait for advice from more experienced members, though none were around at the time.
I have never, and would never, offer advice which I did not believe to be correct. I have read that many accordion tutors suggest that their clients begin with 48 or 72 Bass instruments, and feel that this advice is especially appropriate for a young woman of diminutive stature.
Arianna does not have much money to spend on an accordion, making her choice all the more important. Buying a 72 Bass on which to learn would give her a couple of years in which to save up for a larger instrument, if she decides that she wants or needs to.
Kind Regards,
Stephen.