Max: My small round bowl has the same marking. The small oval has no marking, nor does the larger bowl with the clamped on base. I also have two small oval bowls in clear, and one of those has a gold paper label, MADE IN ENGLAND. both of the small bowls were purchased without the marmalade EPNS frames and then I found the marmalades with the clear bowls in ebay auctions, and just swapped them out. I use the clear versions (now with no frames) for candy or pocket change.
Mr. Vaseline Glass