How do I know if I have an F1 R27 or just an F1??

OK so Ive just bought a Racing Blue F1, and it is badged up as no.385 of 500...

but there's no mention of R27 other than the previous owner has put a delicious R27 badge on the back of the car??

any other ways of telling?
 
There is only one model of F1.

As long as you have the build number, recaros, grey wheels, red brakes you're pretty safe.

Stickers were an optional delete.

Mine also states it on the log book too.