Glass Candy Dish? Any ideas?

My new quest for today...
Try to find out what this dish is, who made it, and approx. age, and anything else I can possibly learn about it. I am no expert on glass items and personally only really collect signed Chalet pieces.
This is again coming from my Mother's estate and has been packed away for a few years, it is a little dirty, should of washed it before I took the pics Lol
It weighs approx. 2.9lbs so is quite heavy, the diameter is 6 1/2 across the top and it stands 7" high with the lid on it, 3 1/8" high without the lid.
It is footed.
The bottom has the number 15 on it, but that has not helped me much in my search.
I think you call this pattern a ribbed pattern and it appears to be a molded piece but even that I really don't know.
Any help would be greatly appreciated.