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I would guess around 1968 -1970 when Webley took over making the Greener.They assembled some guns using Greener made actions for a couple of years then started producing their own version the Greener mark 2 when the Greener made actions ran out and produced the GP to the late 1980s.The Greener GP s we’re made in the 1930s to 1968 .This one is one of the ones Webley assembled using the original Greener actions.The Webley made mark 2 version has clips to hold the pins in place where the Greener version has keeper screws and have a differently shaped safety etc.Basically Webley kind of cheapened the action a bit.Also Greener never made one with a case coloured action only Webley did that on some of their GP Martinis