An original production used 'Klytus' skull prop. 

This was from a filmed sequence, that did not make the final cut, where 'Emperor Ming' is on the home planet of 'Klytus'. Such skulls of the 'Klytus'

race adorned the set. This Skull is the only known surviving flat backed example; the flat backed Skulls were made for placement on ground surfaces

 

We are always looking for original production used items from Flash Gordon (1980), please contact us with details