I believe I met this dealer some years ago when he had 2 RD’s one in his showroom and the other a very low mileage bike in storage. At the time I remember he described the low mileage bike to me but when I saw it I remember thinking it was not as good as he described. I do remember bubbling on the tank around the fuel filler. This may not be the same bike but it appears familiar.
To add an answer to earlier question: I believe there is a manufacture date code on wheels:
My RB wheels have 580 and 680. This I believe May and June 1980.
My RC front wheel has 1281. This I believe December 1981. Unfortunately I can not easily see the rear.
My RD wheels have 782 and 882. This I believe July and August 1982.
I also have another front wheel to replace accident damaged wheel with 786. I bought this from a breaking CX Turbo, obviously July 86.