Almost 11 cms by 7 1/2 cms.
I hope the drill hole won't put them off as it's the only way they'll ever find it! Something is though!
It's slightly smaller than the set before it.
I believe it was made later than the other set too (although similar) so doubt it was used at the Club when it was Playboy (although I could well be wrong) unlike the 2nd set (as I call it).
I do have a full set of the 7 that I know of (well, when I say "I" I mean a collection of 5 different people) but I have managed to find 1 set only with a couple of "extras".
£5,000 (3 known) £10,000 (4 maybe 5 known) £50,000 (3 known) £100,000 (1 known) £500,000 (2 known) of the 2nd set. £100,000 (1 known) £500,000 (2 known) of the "3rd set". This is the one on offer (the spare one anyway).
The first set of plaques were even better (£5,000 Ivory and a real monster and numbered and a £10,000 made from what looks like tortoiseshell. He did own a zoo after all so....).
Hope this helps.