Mystery sugar and creamer

Another of today's thrift shop finds from a Habitat for Humanity Restore shop for $.40 each. Both about 3 3/8 tall and 2 7/8"x 3 3/8 opening. They sit on a thick, cubed base with a deep depression on the middle. They are fairly heavy, but I can't tell if that is because they are crystal or just heavy glass. I have a quite a few sugar and creamer sets, but only take my coffee black and have never actually used any of them. I like the idea of it, though. No markings. Can anyone identify the maker? Thanks!