This is a pre-production hanken that was used to create the pencil board (shitakjiki). More information on this is in the first cel of Lum eating a cherry.
If anyone runs across the production hanken or one of the Lums I don't have (upper right and middle left), it would be great to hear from you. It would be so neat to see the rest of the set. Click on the inset to see a closeup of the shitajiki. (10x14")