I've seen that video before, Christian, and it's very interesting to me as a counterstamp collector. Unfortunately, it unknowingly gives a nod to the counterfeiters who have faked so many of these "Votes For Women" pieces.Adding to Mal's comment about BM's incorrect description of the process as "engraving", it also strikes me as irresponsible. Showing people how to fake a historic collectible is just wrong.
Several years ago a lot of fake Irish political stamps (IRA, UVF, etc.) began appearing on the market. Having a long background in counterstamp collecting and researching, I quickly became comfortable with identifying these mostly amateur looking pieces. Fortunately, most of them have at least temporarily disappeared from the market. Maybe people finally got wise to them, or they stopped "production" because the profit margin wasn't high enough.
Unfortunately, in the past year or so the same two or three counterfeiters of the Irish politicals replaced them with "Votes For Women" coins. I check eBay and other sites regularly for additions to my collection and new examples for my census, and on any given day see at least a dozen "Votes For Women" counterstamped coins offered and they're ALL fakes. I've wanted to add one of these interesting coins to my collection for some time, but don't even trust myself to pick out a legitimate example. Very sad situation.
Bruce