Probably not a BAC, more than likely a BCA, Bicycle Corp of America made in Allentown PA. Later became Ross bikes. Not a particularly valuable or sought after bike but they did make some unusual bikes with cool components. Here was one I bought for parts...26" BMX geometry and style in a lugged steel frame with front and rear Sturmy drums and 3-spd. Kind of a very early BMX-pre MTB hybrid. http://www.flickr.com/photos/david-quickpic/1373151223/in/set-72157602356066779/