With no connection remaining to whoever it was that made it, it's impossible to know "why" it was made; all your suggestions are possible. I would think the most likely is a "con-man", wishing to ensure a coin-toss went his way. A magic trick coin normally has two different coin types (eg. a penny and a florin), or a secret compartment inside a large coin where a smaller coin can be hidden.
The damage may have happened some time after it was made; a good "con-man's coin" doesn't draw attention to itself or look suspicious, and those peculiar dints and markings look suspicious.
The damage may have happened some time after it was made; a good "con-man's coin" doesn't draw attention to itself or look suspicious, and those peculiar dints and markings look suspicious.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis