On your glasses again, just been looking in McConnell’s The Decanter 2nd edition and noticed an advertisement he shows (page 426) for Royal Brierley from the Pottery Gazette 1935. The image isn’t very big but there are some glasses shown that look very similar to yours. They look the same shape but with an inch or so off the top. They look to have a thick black disk foot and rings cut around the bowl, but with the bowl frosted. Annotated on the advertisement as No. 552A. Cocktail Set frosted, Crystal and Black.