Webley MkIV pocket revolver
Manufactured by Webley&Scott LTD, Birmingham c.1929-39 - serial number 41910.
.22LR six-round step-down cylinder, double action, top break action, 3″ barrel.
An interesting factory conversion that had a limited run in the 1930′s, with fewer than a hundred of these ever made. You can see the noticeably tapered cylinder made to turn this .38-200 revolver into a .22LR plinker.