Here's a close-up of the border in case anyone else wants to take a look without having to find the auction site.
That same border is on some original FA Meanea pieces I have.
I was almost certain the wheel I usually use was made by CS Osborne and its impression is about exact in size and dot spacing, etc, to the original pieces. Found it on an ebay auction a few years back. I could be wrong on the maker because Buck is more of an expert than I.
I also have one of the more recent Osborne wheels that Buck mentioned above. It is also about the correct size but was rough around the edges so to speak and didn't make a good deep clean impression although a few minutes with a file and some patients and it cleaned up and works fine. I still prefer the old wheel better but really can't tell the difference after the fact if one or the other is used. If there is a difference in the size and shape of the impression compared to the original FA Meanea pieces you are hard pressed to measure it out and tell the difference.
The sketch of the newer 456-20 CS Osborne wheel looks as if there are two lines but it is really only a single line. Or at least on the one I bought a few years ago is. The issue is the wheel had edges that make an ugly impression and you have to file all that away so the single line and dots are all that makes an impression.
All that said I'm also curious to check with McMillian myself and get one of those if still possible to compare.
I don't know how to post pictures anymore or I'd try and get a close up picture of the one I modified.