The signature definitely looks right, so I have no concern about them. This type signature was used on pieces that were considered artistic enough from the late 60s onward. I checked Live Auctioneers to see what kind of prices these type sculptures were going for. The closest one I found was http://www.liveauctioneers.com/item/352900
, but it is larger than yours. The various Seguso sculptures ranged $500-1000. Your sculptures are a bit smaller, so you might want to aim at the bottom of the range, particularly if you are in the US.
You can also check sites such as Rago Arts and Quittenbaum to see if they can give a better idea of the upper range of prices.