John, is your 5 shilling jeton from an actual casino, or a jeton from the movie?
(I'm confused).

I agree that the 50 & 100 pound plaques in the screen shot look like plaques made by B&G.
One difference in typical plaques of that era is that the movie plaques are solid. That is, they don't have lunettes like most plaques of those denominations would have. (But not needed, nor worth the extra cost for plaques used as movie props.)

It's interesting that the 50 pound plaque has diagonally-cut corners, and the 100 pound plaque has rounded corners. B&G made both styles, of course, but it seems more typical that a "real" casino would order one style or the other.

On a different note, does B&G in Beaune, France cooperate with inquiries about plaques they've made, such as these?