Available only in 1994 and 1995 in the US, the Mystic was a factory custom based on the BMW R100R. The changes were entirely cosmetic, but they were not insignificant. Nowadays a ‘special edition’ just means new paint – the Mystic had several restyled parts.
According to The BMW Boxer Twins Bible by Ian Falloon, changes for the Mystic included the red paint scheme, black frame, lower handlebars, restyled sidecovers/seat/tail section, shorter license plate bracket, a different angle for the muffler, and some chrome-plated pieces
This example has 39,800 miles and it comes with a few extras: Hagon shock, Remus exhaust (original included), Parabellum windshield, and the OEM Integral bags.
Find this mystic for sale in Chicago, Illinois for $5,100 here on Panjo (registration required).