So I got one now, too. New old stock in original packaging, a nice collector’s item 🙂
The package says “1500 GOLD BRASS”, and amongst other advertising statements:
“- Combination can be changed for renewed security. Chances against guessing combination are 9,999 to 1.”
Printed instructions as in the picture above, but no instructions on how to change the combination.
Did somebody find out in the meantime how this is done?