Yes, as Christine said, the example from my collection has the mark of an importer/ retailer. Most examples are unmarked. The pattern seems to have been quite popular in the states: I have two examples in my collection, both bought at auction in the US (only one has the FBS mark).
Regarding value it's very hard to say. Reich opalescent glass is not all that well known, is hard to find and is often sold without a correct attribution. Because of this it's not easy to find sales records and look at price trends. Both of my examples I purchased for somewhere around $100 USD each at auction (possibly even less for the marked one), but then both were unattributed and I consider them both to have been bargains. However, in a specialist art deco dealers' you'd be looking at a retail price of many times this figure. The metal mounts on yours are also very attractive and might well add to the appeal. In the days when I was selling this type of glass I'd have probably expected to get around 200GBP (~300 USD) each for them, but might have settled for a little less. However, I no longer sell -- partly because I think that opalescent pieces like this from the less well known makers are undervalued at present -- hence why my apartment and office are crammed with shelves and boxes full of pieces by Jobling, Reich, Hunebelle, Barolac, Sabino, Verlys, etc...
