When I was a kid (70s) there was a shop in town that did engraved signs. It led me to believe that those signs were made the same way, as the samples on display looked an aweful lot like the signs seen on screen.
The signs made at this shop were made using a laminated piece of plastic, maybe an 1/8" thick. It was 2 ply, and for these signs they would have used a piece that had a black layer and a white layer. The letters were then made by using a machine that would remove material from the black layer deep enough to let the white layer show through - so it would carve "ditches" in the plastic to make the letters.
I don't think they had more then 2 or 3 fonts to choose from, maybe only one.... I know most of the signs used the same font and it appeared (without supper close scrutiny) to be the same as those in TOS.
Yes. Now all we need is one of the engravers from the 70s with those three engraver fonts to get these exactly perfect. Unfortun ately, everyone has long ago upgraded to engravers that do a zillion new computerized fonts--none of which, interestingly enough, is the exact style of font vthat was used on the old 70s machines.
So, if you wanted to get real picky about these signs (instead of using Arial font which is pretty close but which wasn't invented until the 80s), you'd have to find one of those real old machines, or re-create the old font as a True Type font style so that one of the newer engraver machines could use it.
Is there anybody who would actually go through that much trouble?