Described in the Kew archives as a 'Glass Marmalade' - although since the original design lacks a lid, then possibly not a container for permanent storage in the way we might now use a lidded jar for jam and marmalade............ perhaps used for serving at a single breakfast - washed and cleaned - and this repeated whenever the dish was needed.
This item appears on Neil's marvelous pressed glass site - under P.V. - where four other unrelated shapes are shown, all presumably carrying this Reg. No. ......... I could be very wrong, but my opinion is that the features they all seem to share in common would suggest that the design features being protected were the saw-toothed rim and the pattern of upright mitres.
I don't know if we have one in the flesh so to speak on the Board's archive - Fred will know of course
