After Anne's comments on what I thought might be a sugar bowl, I now wonder if this could also be part of a trinket set.
Started searching some more, and found that it resembles Regstered design 638874 24 June 1914 which is pattern No 283 in the Davidson catalogues somewhat.
And, no, I guess it's not depression glass. It has tiny nicks on the underside of the rim, and the rim has the seam(s).