My guess is American, early 20th c, but no clue who the maker is. Ive seen very similar Gorham salt cellar, but not a set like this and the green glass seems a little unusual. I absolutely love this set, but hope to find out more about. The pieces are all marked with the same sterling punch on the bottom rims and the spoon stems, and the mustard pot has the 69 mark beside the sterling mark and on the underside of the lid - which i suppose is either a pattern mark or a lewd suggestion. Thanks in advance.
I would agree that it’s American, probably around 1910. In the absence of any other marks, no clue about the maker, alas.
But oh, what a lucky devil you are - all three of the original spoons still with the set! I’ve got a small collection of sterling mustard pots, and only one of them still has its original spoon. They usually go missing. 
Yes, thank you, couldn’t believe my luck. And the mustard spoon has a little gilding still on the bowl.
Bart, where are you when I need you?
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Paul, thank you for calling me. A sign of this is that I am needed and helpful here. 
I do not skip any thread or request for help. If I am silent, it means that I am searching or mourning a loss.
At this point I resume your search.
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I tried a visual search on the unique pierced pattern items which came up with no matches. The 69 is probably the pattern or shape number. Silversmiths did mark some of the lids and bottoms with a mark indicating they were a set. I’ll try more visual searches the cutwork is very geometric hoping for a match.
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Done the same with no matching results.
Many thanks for your efforts. Yes it defeated me as well. But it is a very pretty set and will remain much loved if unidentified.