As I recall, In the UK anyone can check the registration of the word VINCENT in Motor vehicle parts, which would apply to motor vehicle parts with the word VINCENT on them. [as opposed to motor vehicle parts without the word on, or crockery or tee shirts or whatever with the name on]
Also, a licence agreement could be reached.
Precedent use may also apply.
Logos are different again. [Not necessarily with the word Vincent in] someone else may have registered some of those. [Vincent factory never did]
Company names are also separate.
Whether UK registration now covers Europe, who knows?
And then there's USA, which is a whole new can of worms.
So, it's not entirely straightforward, and it may all have changed?
Going by previous projects, if someone wants to blow zillions of pounds making trick Vincents, good luck. [but who actually WANTS a trick Vincent?] But, I'd put my money in Premium Bonds!
Regards,
delboy.