Replacement seat/helmet for your Transformers G1 Headmaster Jr Hosehead. The model is a close reproduction but not exact so that they can be differentiated. Compatible with original G1 parts, and with the PRHI Hosehead Weapons available here:
https://www.shapeways.com/product/TJZ78TLQ2/prhi-transformers-hosehead-weapons
Photos are of home-printed prototypes.