Hi again. To finish this question of mine as to whom made the gun, I suggest the following. A learned member in Australia, previously unknown to me, has alerted me to the locking action being a Webley "Screw Grip" dolls head. As Webley and Scott were prolific gun makers for the trade, I am happy to agree with that.
Cheers to all who read the post and to those who contributed.
https://www.usedguns.com.au/pics/016-001-2019-11-07_03-23-48-PM.jpg
https://www.usedguns.com.au/pics/016-002-2019-11-07_03-23-53-PM.jpg