The RT looks to be in original fitting. But its hard to tell from these pictures if its an Original RT for certain. Even though the wheels and the thick style trim tells me its a pre-67. Furthermore, thick door posts tell me its a pre-65, which means it could very much be an original RT because I believe the last RT known to be produced was something between 63/64 - all pre-65s have had thick door posts with smaller windows (although bumpers and fenders tell the story differently - but it is normal for an early bug here in Pakistan to receive post 67 fenders as replacements).
May be some closeup pictures would help us answer your query in a better way, if you could arrange those. And if its original, its some discovery you have made buddy.
My suggestion, you get the closeups and share with the readership and if necessary take along some veteran to confirm if its original RT as the bug seems to be in RWP to me.