$2500 is salvage pricing for a R100RS.
It has Motosport badges and the proper orange stripe over the headlight area. It may or may not be the "real deal" but if it is, some folks think of it as the Holy Grail of RS's.
I have an '85 with both seats, k bike bags, OEM original tank bag and nearly 70,000 miles. I wouldn't sell it for a dime less than $8000.
Pastor, Church of the Horizontally Opposed Air Cooled Twin
'66 BMW R60/2, '83 BMW R100RS,
'81 BMW R100RS "Das Beast", '77 Honda XL125