There was an info by Trev in regard of London leopard`s head with distorted facial expression; the engraver was struggling with failing eyesight and was replaced.
500 punches annually !
I think it also worth noting, is the huge amount of punches that were supplied to the LAO by the engraver, in 1820 John Smith was recorded as supplying nearly 500 punches annually to the Company.
Of course, London was huge and busy assay office, but I am sure that main Russian assay offices must have had hundreds different punches. And individual silversmiths definitively had more than one punch.
Meaning, variations with marks are acceptable and legitimate if everything else is correct.
Have a peaceful night