I have seen three Commandos first hand (excluding 9" and 10" blades of similar grind) and photos of a few more.

The big bladed ones are almost too big to be practical and I don't know if they are actually Commandos per se.

The generally accepted line of thought is they were mostly 7" with a few 6" examples thrown in. I think it was Beaucant that stated Bo told him he made very few. Gaddis states it similarly.

I don't recall seeing one with a monel wrist thong link.