Good point Jonesy. Blumbly's #122228 looks to be the genuine article, so I reckon a minimum of #122000 is pretty much certain.

Blue, you mention wear around the rod receiving notches.My example has a broken clip on the rear left axle housing which I always presumed was caused by the old rear flap being ripped off when the owner had jack of it. As such, I always check for broken catches as an indicator of an Auto being the real deal. The following Auto looks like the front flap was ripped off with some pretty serious force. Its serial #125961:



[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]