I have a skywarp and now a thundercracker that have the solid wings, no washer in the neck, short pegs and no takara/hasbro stamps. According to Fred's there is a valid no stamp version. The lots they each came in had several very early g1, like a grey/metal plate prime, and nothing about them seems like a KO. Comparing them to my existing ones with stamps again there seems to be no quality differences. I have assumed these are legit but I just wanted others thoughts or any other references other than fred's workshop that anyone knows of. I don't have picks of the left leg but it is blank. I'm curious what others think. Thanks for any feedback/thoughts.