I have a twelve speed SR Gran Course that was purchased new at The Magic Mushroom bicycle shop in Glendale CA back in March or April of 1980. It is outfitted with Shimano 600 derailers, brakes and hubs, Araya 27 inch rims, and SR crank set, seat post, handle bar and stem. I have always understood that these bikes were made by the same SR that made components at the time because that is what the owner of the bike shop told us when we purchased it. Hopefully he knew what he was talking about and wasn't under the influence of magic mushrooms.