Dating a rickenbacker
Trademarks are similar to copy writes except that copy writes are proof of ownership of the arrangement of words and or musical notes, pictures and videos whereas trademarks prove ownership of designed shapes, names and logos.
As long as RIC owns the trademark shapes, any copy of these shapes is an infringement.
I'm sure and I hope that RIC will always own these shapes.
There are copies available of Fender and Gibson instruments.
Some people will make or buy a fake truss rod cover to try to sell their used fake as a real Rickenbacker.