The Hornby Gods were a little kind to me so for Christmas I have some new treasures coming 
An early No.00 or M1(?) loco and tender from around 1923-6 This was one of the cheapest loco's and unusually does not have the fixed key with it being a short shaft version .. Cheap Cute and Survived 
Hornby was a little confused in marketing/labelling these trains they started life as "The Hornby Clockwork Train" in 1920 then as the Model No.0 then as the cheaper set was made the Model No.00 , then copped description in some circles as the (M1) ,then with the George the Fifth versions arrived they were renamed the M-Series No.3 ( M3) and again cos we werent confused enough, Mr Hornby in 1928 allocated the M3 to an entirely different bodied edition LOL!
As part of the deal I also got a spare locomotive and three more tenders ( of differing numbers/sets, M1 M3)
This loco as you can see DOES have the fixed key clockwork movement and I think that makes the top photo locomotive a first run of the series still having the unit from the original Hornby Clockwork Train , the top locomotive is also nut and bolt construction indicating its early
