An old friend gave me a very battered Rotary Aquaplunge, I wonder if its possible to date this watch?
The back has: 'incabloc', 'antimagnetic', 'steel case', 'automatic', 'swiss made', and the numbers '61 41 85' on the back. Stamped roughly in one place with '485'.
Its not as yellow as it looks - that's my bad photography, its steel coloured.
I'm very please with it, but it loses about a minute every two days, I guess it needs a service.