Gary, you got me scratching my head over the name Sercas, hadn’t heard of that one so looked it up and found they made the comb locks fitted on Juwel safes with the old telephone style dials.
Amazing (make that frightening) how many safes get used on factory settings and really basic numbers. Remember a building society 20 years ago where the main atm cash safe was still set on five turns to ‘50’.