Snap action tumb lever was discussed here on this line.
https://www.doublegunshop.com/forums/ubb...&PHPSESSID=

here is Diggory on the thumb lever and snap-action underlever which this gun appears to have:


This from Shotgun Life: https://www.[censored].com/shotguns/guns/purdey-8142-visits-nebraska-bohemian-alps.html
Purdey’s patent number 8372 was for the second pattern thumb hole action,

Here is Diggory on Purdey patents:
https://www.vintageguns.co.uk/magazine/the-patents-of-james-purdey-the-younger-2
Patent No. 1104, of 2 May 1863 – Double Bite Snap-Action (“Purdey Bolts”)
Patent No. 424, of 14 February 1865 – Single Bite Snap-Action & Others
Patent No. 1464, of 25 May 1866 – Loaded Indicators
Patent No. 2319, of 23 July 1868 – Adjustable Elevation for the Breech

Patent 1104 would have expired on 1 May 1878. Don't know about the snap lever patents. I have the gun being serial numbered in summer 1878 - obviously an estimation,

Last edited by Argo44; 06/22/20 07:56 PM.
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