With so few made and a limited history on resale, my partner and I are trying to determine the value of a 1977 Silk 700s Sabre MK2. We have a very nice example here in the United States, that needs a little sorting but cosmetically is in fine condition. It is on the known list with frame and engine numbers - 700s/2/63 700s/2/65, respectively. The motorcycle is potentially for sale however at this point we're just trying to understand its value. Appreciate any assistance from the Silk experts.