For black hard rubber pens normal wave chasing was identified by the digit 1, while the larger wave chasing has the digit 0. The colored hard rubber were indicated by the digit 2, and besides the usual color of red and mottled hard rubber were also found specimens with bright colors similar to those of [[Waterman 94]] (yellow background with green or blue veins). | For black hard rubber pens normal wave chasing was identified by the digit 1, while the larger wave chasing has the digit 0. The colored hard rubber were indicated by the digit 2, and besides the usual color of red and mottled hard rubber were also found specimens with bright colors similar to those of [[Waterman 94]] (yellow background with green or blue veins). |