like the wall and lawn Ken

you must send some of that sunshine to the U.K. - been the coolest/dullest May in the U.K. for some years. Your pickle is a great piece too and attractive engraving. The op's. example is cut rather than engraved.
appreciate your confirmation of use re the op's dish - still, I'm guessing a less than common shape even for States pickle/relish/olive dish - those that I can find in the books are canoes, oval or rectangular.
Without labouring the point too much, but just to comment on cutting styles and related periods, and reasons why, in my opinion, brian's dish almost certainly isn't as old as he was thinking ...............
U.K. Georgian table glass 1790- 1830, which is the most commonly referred to period, is characterized by relief diamonds, blazes, strawberry diamonds, saw tooth rims, cross cut diamonds and deep mitres, often covering the majority of the surface of the glass.
Mostly because of the lack of these known typical cuts, plus the shape and rather meagre amount of decoration, my opinion suggests this one is much later than the period I've mentioned.
I get the impression from reading some of Jane Spillman's comments that there wasn't a comparable trade in home produced cut glass, in the States, prior to ABP. Your market borrowed English and Irish styles, but home produced cut glass seems to have been insignificant during the early C19 - the answer probably being found in the statistics in Westropp's 'Irish Glass'. He gives details of the truly staggering quantities that were sent from Ireland to the eastern Seaboard, produced possibly with cheap labour, and perhaps your home market found it more economic to import rather than to produce.
So my thoughts are that as this piece lacks similarity to European Georgian glass - appears to have no obvious connection with States American Brilliant Period - it is therefore most likely to be post c. 1915 - but probably State side in view of the shape. Nonetheless one hundred years old, and being utility could easily show the wear as mentioned by brian.