Hi Heamatite,
but is this really of their making?
It's an important question and that is the very reason that I chose to use the word 'attributed', and also the reason as to why I started this topic:
Advertisements from British Silver-Platers that Show their Marks
I'm not for a second saying this mark is not that of Israel Yudelman & Sons, it almost certainly is, but I would be a lot more comfortable if I saw some actual proof that it was.
In this case we appear to have some evidence that the item is indeed plated by the inclusion of the centrally placed, what appears to be, 'pelt' mark, a somewhat popular mark used by some platers that likely represents a 'skin' of silver covering the piece.
Trev.