Have you an image showing the safe hinges?
I’ve had this issue before with regards aging a product by its hinge design. It’s not written down, but with experience, we can get the safe pinned down quite accurately. Oldlock, may not agree here…. however.
If the safe has a serial number, poss stamped onto its body front facing above its door, there is an outside chance of one of us in the know being more precise.
Hope to hear from you.
Regards
Russell
Withy Grove (Leeds) Ltd
Est 1850 & celebrating 160 years of Safe supply.