Last April (2007), I came across this listing at the KEW in their public search area (but can't find it now). I did a 'image capture, and have the illustration on my computer. there were notes under the item: "This design was also registered in Class I - Metal, Class III - Glass, as well as in this class, Class IV - Earthenwares. This means that the same design could be used for a variety of objects of the same form, but made from different materials. Multiple class registration is often used by manufacturers of cosmetic/perfume containers."
This piece was registered as a "class 4, ornamental design for a jar."
I have seen the vaseline glass version that had the diamond lozenge marking on the inside of the dish. Now, here is the kicker: I have seen (have the photo SOMEPLACE in my computer!) of an opaque blue version, with a raised marking on the inside of the base, and it said BACCARAT. So, It looks like the person who registered the design also used it with at least one other manufacturer. It is not known who pressed the vaseline glass version for ALFRED EDMUND EDWARDES, Alver Cottage, Twickenham Green, Middlesex. The Catalog ref. for the Image details are: BT 43/68. The Registration details for No. 183953 is catalog ref. no. BT 44/8. OH, the official listing at the KEW, shows the last name as EDWARDES with the extra 'E'.
Hope this helps!
aka: Mr. Vaseline Glass