Regina music boxes, buy and for sale, with some tips before purchase. Regina music box disc sizes Eight inch Eleven inch Twelve and quarter inch Fifteen and a half inch Twenty and and a half inch Twenty seven inch. A 32' disc was cut for a star wheel-activated piano, but this instrument is not technically a music box. Regina Music Box Serial Number Lookup Average ratng: 9,6/10 7134 votes Maton Serial Numbers Search. At the turn of the last century, The Regina music box company's sales grossed about $2 million a year at a time when a loaf of bread was 1 cent and a bank teller made about 7 dollars a week.