The Model 23 Classic was first introduced as being available in a four-gun set with matching serial numbers, but they were soon available seperately. I bought the .410-bore at a shop in Alexandria, Virginia, in September 1986. Then, while hunting in the heartland that fall, I got the 28-gauge at Guns Unlimited, the day the Volkmer-McClure Gun Owners Relief Act went into effect, 17 November 1986.