Dating from the late 1800's and measuring 7/8" NBS Medium, here we have a molded clambroth glass button featuring a pearlized decorative finish and a molded TRIANGLE - or ALL OVER pattern. This would be a good example of either of those patterns, if you are putting together a tray of patterns. In good condition except for very slight wear to the pearl finish. It has a molded self shank with thread grooves. $5