My dad travels alot for work and often brings coins back.. I have had a bag of them for a long tiem just haven't bothered to look I 'm sure it has been said here before but I got a couple Singapore fifty cent pieces with the edge lettering on them. Didn't know they had that only because I never thought about looking at them until I was packing to move. I Think it is funny, only because with all the prez coins all you look for is errors on the edges and that is exactly what I did when I first saw these.
I think it's more common than most realize. The US used it in the early 1800's on half dollars, and later on Double Eagles. I don't think there was as many problems with it 200 years ago as there are now. Thats kinda goofy. Guy~
I think(?) that the edge lettering on old US coins was done with a collar (like reeding) rather than what the US trying to do now. Basically 100% effective but much slower. And they had to use a split collar which would be a new technology for the current Mint. And we can see how well(!) the Mint handles "new" technologies.
that's because back then the workers had more pride in their jobs and weren't allowed to have a cell phone while working. NO! grizz
There are edges made even back in 1700s. Those are extrusive text, not intrusive text like current coins these days. And oops forgot to mention that it's Russian coins that I am talking about atm.
In Europe, where edge lettering is fairly common, most edge inscriptions are incused indeed. The 5 CHF coins circulating in Switzerland, however, have raised edge lettering. Christian