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The short answer is 'no' - I would have worked that one out

. There is no saddle stem clamp - the gallows type seat post has an internal expanding wedge like the handlebar stem. All it does is hold the seat stays to the casting at the top of the seat post. It doesn't have any other function and removing it doesnt allow those stays to be moved though they are loosened. Told you it was a poser!
Sorry Steve, The saddle is not clamped, as you say, it does have the expanding cone bolt etc. Same as for the handle bars. Again just like a pedal bicycle.
You changed the topic from the AJS factory picture which is 1929, to your 1926 G8. I was referring to 1929 saddle which is clamped. Rob