refers specifically to problems with Steck numbers, and there is no simple answer to this, unless there are any datemarks inside the piano.
My own Steck Pianola has this problem, and although some lists suggest that it is 1914, I suspect it is from the twenties.
I'm sorry I don't have any control over the picture downloading on this website, but it is unlikely that photos will help with dating a pianola, but if you want to email them to me, I will try to post them for you.
Email via my website.
If you find old references or links on this site to pianogen.org, they should refer to pianohistory.info