OM603 w Head casting # Upside down--Fake?
 

Recently ran into head #22 w/ Number upside down.

Has anyone EVER seen the Casting # on head upside down?

Australian engine?:D

Or spinal inversion?

Just look at the number from the opposite side of the head and voila!

Unlikely a fake since making a mold and sand-casting is very expensive, so probably done at only one foundry. If a stamped number, then likely a worker error. If the numbers are cast-in, that could also be an error since I think they nail the PN plates to the mold, as you see the nail-heads in older cast blocks.