Manhattan(1938-1943, ref: Collectors' Enc. Dep. Glass, Florence)http://www.justglass-online.com/shard2.html
-Manhattan has angled ribs and ball feet. Not yours, especially because of the ball feet.Not
Park Avenue (1987 onwards, same ref). http://www.hillhousewares.com/category6maker20pattern397.html
which has the same angled ribs, by which I mean that the cross section of the wall forms a zig-zag pattern. Click to see the full sized image to see what I mean. Again, yours seems to me to have a different profile -- more like ribbons or bands.
I'm thinking Anchor Hocking "Celebrate", which is still being made now (and was probably inspired by the earlier patterns). http://www.anchorhocking.com/products.asp
Note the shape of the cocktail shaker, which seems to match the profile of your tumbler, and the form of the ridges, which form bands in the same way as yours.
Need someone else to have a look to concur on this.