Anne E.B.: your little piece shows up in GLASS TOOTHPICK HOLDERS, (revised/2nd edition) as FRAMED OVALS. The height is right for a toothpick holder. maker and date are unknown. My personal opinion is European. It is known in clear, decorated clear, opaque blue, cobalt blue with gold decoration, opal/milk. in the book. I have also seen it in yellow vaseline/canary. your version appears to be green uranium (still uranium glass, but more green than vaseline glass). both the vaseline and green uranium versions are not listed in the book, but the authors did not document anything from 'speculation'. If they had not seen a photo or seen it in person, the color did not get listed in the book (authors are Tom and Neila Bredehoft, and Jo and Bob Sanford). book reference was in the category of 'foreign toothpick holders/date unknown/pg. 241.
Dave
(aka: Mr. Vaseline Glass)
p.s. I did not look in the children's glass/toy glass books......it might have also had an alternative market for toy spooners.