unusual pair of Boch vases

Here is a very unusual pair of Boch vases in a classic modernist shape with birds. The colors are quite striking and this is not a model I have seen before. It is always unusual to find a matching pair, especially as rare as these. The colors are gray, blue, white and black. The stepped up design is quite nice and the pair, which are in perfect condition without restoration stand 10" T X 7" W X 7" D. The 8 sided shape lends itself quite nice to the image of the birds flying through the clouds. The piece has a mold mark on the bottom "1021" but there is no signature. These may have been some experimental design that was never made as a production piece, which makes these curiosity's quite rare.