Engraving fonts are tricky, they are all proprietary to the software, meaning a 3 line roman font from New Hermes will not be the same as a 3 line roman font from Vision or Newing-Hall, which makes tracking it down very difficult.
For these annual plates, if we didn't engrave them previously, we tell the client we can't guarantee a match, i'll spend a few minutes looking, but unless they want to pay me to search through a huge book of fonts, they get the closest I can find.