We don't know the model name for this black-hard rubber Wahl pen, but it is a very nice example of the company's 1920s manufacturing. The pattern is still crisp and there is minimal brassing. We couldn't get it open, but it does still have a working ink sac inside it. There is a little chocolate hazing overall with some larger spots of it on the cap. You will write a dry, extra-fine line with a little feedback...but the 18k gold nib also flexes just a little to give you about a half millimeter of line variation. Long and slender. 13cm capped.