Are you sure about that Larry?
There is the AC15-AC30 photographic comparison that you can find here, which proves it without a doubt:
http://www.voxtalks.com/ac15p~1.jpg
But for the skeptics like Larry, I'm also basing this on the fact that Lennon bought his AC15 twin in July '62, according to the H/P paperwork that I have a obtained a copy of, of course you will find a copy of it in the Beatles Gear site that is going up in the next few months. It matches the other H/P docs that Andy has published in the book exactly, same paperwork and hand writing. Ask him, he's your pal right? I sent him a copy of it a few months ago after his book was already on the presses, just a hair too late to make the book, a shame for sure.
Hope this helps clear things up.