12-02-2020, 01:16 AM
Aluminium boxes began with the first model (1923) sold. I'm not at home to check correct dates, but in the 30s they went to cast steel, then for a time they reverted back to aluminium, then by 1936-7 on the Ruby-type models they went to a different "hour-glass" shape in steel. Hopefully someone with access to reference material can fill in the dates if you wish to know more. Cheers, Bill in Oz