here is pic of my 'short' hemi 9 insulator. Next to normal sized one. kinda like me standing next to Mr Jung. Note the patent date embossing looks like it was squeezed in similar to hemi 19 CD 162 with transition embossing. i've seen one other and looking to see what else exists. i'm thinking the mold was ground off after wear and tear and they were able to keep using it.

If you have any cool non stamped hemi 9, i'd love to handle them at springfield.