In the first few years of the Thomas Glenn Holidays company, the wave design was extremely popular among collectors.  This now-retired example has black waves set against a white background.  The counterpart ornament, #517 which is also a retired item, has red waves against a green background.  Side, top, and bottom views are shown here.  Once sold, this item will be removed from the website.
The Wave - Black & White Ball Ornament 
Handcrafted in Poland
Made from glass
Approximately 4 inches tall (10cm)
Made by Thomas Glenn Holidays