you will need at least a full vin or it will need to be fresh registered
chec this
https://www.thesamba.com/vw/archives/info/bugchassisdating.php but as you can see , no 5 digit chassis no.s
this will point to a problem
chances are its been doctored some way.
if you can get the chassis no , send to vw and get a birth cert.
£55 / insurance and a bert cert will get you an age related v5