That’s rather nice, very interesting indeed to know that Milners had a Dutch agent at that time in history.
Thanks for the very good pictures.
As to value, it’s hard to say as very few people collect safes, the plates & escutcheon would be more saleable, but again I find it hard to place a figure as I have never seen those exact designs. There are users of the site who collect safeplates who maybe able to advise further.