the smaller bowl does appear to have the right proportions for a f/bowl, although everted rims like that are not the norm - and it's quite unusual, but I can't off-hand think of any other use, so am sure you're right.
F/bowls were common place items around the period we're speaking of, and many suites of glass would have included them.
Probably because of their association with affluence, they seem rarely to be items of pressed glass, but since there are pressed rinsers, then no reason why not pressed f/bowls. Both items are virtually endless in their variety - but make good areas to collect.
This ribbing would give strength, but then again might attract wear more easily - good piece to have though.
