The lens sizes were different between ther older and newer folders, and quite possibly between the autograph series as well. I have a 1A that I was able to get another lens for, from a forum member. I believe my lens is a 23mm, but don't have it with me to check. Just measure the lens board opening and search according to the size and coverage. Make sure when you buy you get the ability to return the lens if unsuitable. It's also possible to get a little newer lens for your camera but watch the coverage. Maybe someone can chime in and let us all know how long it was, that lenses in that size were manufactured.