if you pull those old refillable bottles out, look at the bottoms, they should have a bottling plant ID & date on them... might help you get a time-line on your machines working past...
Good idea. From all the literature and pictures I can find, it has to be a 1955 model...or early 1956 at the very latest.
The series was described in the Billboard article I posted earlier from 1955.
The white tops were a new design phase in 1956.
My guess is the machine was made in 1955.
It's no telling when the bottles in it were made or their dates.