It’s on the slightly smaller side at 34mm with the crown. Here is the translated listing
“Old watch from the Kardex brand (belonging to the Universal Genve). Full stainless steel diver's watch with a 25-jewel PUW 1360 Aurotor caliber. The clock works, however the balance seems stuck, it needs a good cleaning and fine tuning. It has a cadet size of 34mm with the crown.
Certified international shipments are made
Please note that this is an unrestored antique watch.”
Edited by a mod Jun 1, 2023