These are 5" wide x 3-3/4" tall BSA 650 Thunderbolt red, black, yellow, gold, blue, & white die cut vinyl decal stickers and they are sold in pairs. They are for the side cover panels on 1968 BSA 650 single carb A65 Thunderbolt. There's the British Union Jack flag on the left crossing a BSA flag in yellow & red, 650 in gold, Thunderbolt in a red reverse print on the checkerboard triangle. Photos added of a 1968 A65 Thunderbolt with this design. These are die cut vinyl stickers that are easy to apply. 

My name is Tony Schanz, I formerly ran DomiRacer Distributors in Cincinnati, Ohio buying and selling vintage English, Italian, & German motorcycle parts, tools, accessories & memorabilia. DomiRacer closed 6/11/2013, but I still deal in parts, motorbikes, decals, advertising, photos, posters, & more. Please add my store, The Real DomiRacer, to your favorite sellers and watch for other rarities in my future eBay listings.