[Plazmaduck]

More info at least.

 

[Plazmaduck]

Just to add, "N. K. Co" is the mark of N. K. Watch Case Manufacturing, a company started in October 1937 and named for Nathan Kayman, a jeweller of Russian extraction. According to Priestley, the punch was registered in March 1946 for Szlama-Lejb Ryngelblum and Moisze Libchaber, who were Polish gold and silver casemakers working for the company.

Here's an advert that ran in the HJ in the late 40s and start of the 50s.
View attachment 88154

I came across them because the company was bought by Excalibur Jewellery Ltd in December 1974. From what I could see, they made gold cases for Accurist, Helvetia, Benrus and others.

Thank you for your reply and research. Shame there are no pictures to verify. This one seems quite elusive to find anywhere, I would have expected at least one similar design but it seems not.

 

[Plazmaduck]

You're in luck. From a rather poor scan of the Great Universal Stores catalogue of 1967, it looks like the same watch.
View attachment 88224 View attachment 88225
I make 20 weeks at 11/- a week £11. That would be a deep discount from @Eaglegale 's list price of a similar watch, but still gives GUS a profit.

That's definitely the same watch, right down to the large gap on the winder. Amazing find, thank you. I guessed realistically the price "then" won't necessarily correlate with its worth even allowing for inflation etc.
Time to squirrel it away again it seems!