Thanks. I run a forum myself on sailing so I am aware of not being a newbie idiot so did as much ground work as I could upfront.
I have enjoyed finding out about these.
The challenge is the servicing costs are a high percentage of the watches worth.
I think I'll get the round one done once I've got over the bill on the Zenith.
The round one is 1965, would have been nice if it was 67, my birth year.