Rasputin
·Recently acquired this two tone blue beauty which I assume utilizes cal 431. Based on my past experience with Ultra Chrons the manual date adjustment was performed by cycling between 9 pm - 1 am. However I’m unable to do so on this model despite no issues with the date advancing at midnight. Was there a point in the Ultra Chron’s production where the date was not adjustable? Or does watch just need a repair?