vintage rose pink depression glass flat tumblers, Federal Lido optic pattern?

Set of six vintage pink depression glass tumblers, all in very nice condition. These look like Federal Glass Lido pattern to me (stacked rings or 'bubbles', optic glass).

But I'm having a hard time finding pictures of the flat bottom tumblers in different sizes, and can't find anything exactly like these. These are about 5 1/2" (5 3/8", maybe?) tall.