The first one pictured could be a model 45 Diana from Mayer and Grammelspacher of Rastatt germany. First manufactured in 1928.
The reason for thinking this is that it looks remarkably like the Webley Mk. 111
which is what Webley copied it from, with one exception and that was changing the tap from the left to the right. A retrograde step in my opinion, as a right hooker.
Refer to Chris Thrales Webley Air Rifles book p54 for the full story.
I could be horribly wrong but it looks a 'ringer' to me.
Carl.