Yeap 5 minutes at a time (until happy), use a nail brush/tooth brush, & rinse well.Clean it with lemon juice and a soft brush? Or just have it laying in the lemon juice for a while?
Now we know its British Royal Navy, early 19th C, or a bit earlier!
No links, just experience, although the backmark will help, what is it?Ive seen germans exactly alike also. Could you post a link or a picture?
OK, might not be British.Cant clean it any more up but i can say some letters on it. Something with «war» «d •»
Hard to tell the rest :-/