Here's my friends MCF engine built by Mark Kirby in the early 90's before Mark came out with his own heads. Notice the ID tag.
All MCF heads were produced with the MCF logo. As intimated by Bored&Stroked,noone in their right mind would ever grind it off.
PLEASE POST PHOTOS.
PS: There is a company called Flathead City that makes their own heads. Maybe those are what you have?
http://flatheadcity.com/parts_department.html