As one who has had to load up the letter plate on an old TH pantograph engraver many times, one identical to those used at Enfield, it just depends upon whoever loads the font into the engraving machine on that day.
Reading this thread I'm minded to ask whether D&C DID in fact guillotine their rifles but some wag, knowing this, has 'resurrected' the numbers, knowing the originals will never emerge. Just a thought..................