As already mentioned by a few on here... I would leave it as it is. It looks pretty mint and if it is all original i wouldnt touch it.
The minute you start to break that up would be sacrilige and you would be destroying an original and honest bike.
Some bikes need a resto and some bikes need to be left as found. That is screaming to be left alone IMO (even the tyres).
The irony is lots of people restore bikes to their original spec and there you have a very rare bike in its original spec