The Clubman is an uncommon model that was a little more sporty than the average utility "lightweight". Part of the issue is how small the market for an adult-oriented, sporting bike was in the US in the 1950s. I don't know how many of these Schwinn sold back then, but probably not very many. We rarely see them today. The automobile was king of the American road in those years. This one looks like a 1950s era bike to me. The few I have seen were early and mid 1950s era bikes. I don't recall that any were the larger frame size that you have there. As GT mentioned, take a look at the rear hub shell for a month and year date code. That older model of shifter usually appears on 1940s era bikes. I'm wondering if maybe it was a retrofit, but see what the hub shell says first. There was a handlebar click shifter more commonly used in the 1950s. Part of the challenge in dating the bike is how unusual the Clubman is today. But maybe the hub shell will send you in the right direction. It's a very nice, very unusual piece for anyone who likes old Schwinn road bikes. If your friend likes old road bikes, this one is a keeper because good luck finding another one in that size, color, and condition.