Can't help you with the movement cal. but did you know that address on the Ad above is next door to Bravingtons head office in Pentonville Road? They were a importer of several Swiss watch makes from the 1930's onwards and 294 was almost certainly their import business address and workshops, 298-296 being their retail showrooms...
I did some research on Rone watches when I had this pre-war Rone refurbished for my brother.
It originally belonged to his father, our mother's first husband, who died as a Japanese prisoner of war..
Could someone please send me a 1:1 copy of the suspension spring setup from "The Horolovar 400-day clock repair guide" ? I think I have the same movement as Mattaphysics my-first_anniversary-clock . I am planning to buy the book later its available from cousins .
My best regards,
Today's mystery movement, in the Rone Sportsmans watch I just posted in the Watch of Today thread.
Does anybody recognise this? It is very nicely put together, but my quick stint in front of the Google machine didn't come up with a caliber number, and no, before you even ask, unfortunately I didn't take a picture of the keyless work.
More about the Rone brand here -> https://thewatchforum.co.uk/index.php?/topic/115422-rone-watches-nothing-to-do-with-rolex/
Take the movement out of the case. Move the minute hand manually for the warning and watch the rack drop, take note of where the gathering pallet engages the rack. The correct position for the snail should be for twelve o’clock it should be about, see red arrow. Forget the black ones. Try that first. Let me know.