Identification of these Blenko Vases?

Hello! Can anyone tell me about these two Blenko vases. I acquired them many years ago, and I'm surprised that I'm unable to locate them on e-Bay or online among all of the Blenko glass. I know they're Blenko, because they both have the oval Blenko decals. They're virtually identical, although, as can be seen in the picture, one is a little darker shade of blue. They're approximately 19" high and just under 6" diameter across the base. I'd appreciate any information as to when they were manufactured, what value they might have, or what references would give me such information. I wasn't successful finding them on the Blenko site. Thanks, in advance, for any information.