Hi,
Made between June 1913 and February 1914. Despatched from the factory between June 1913 and September 1915. All were Standards .177 and .22. Most despatches mid 1913.
The S in the serial number denotes a double safety sear.
I'm not very good at values, between £100 and £200 depending on condition. It looks nice to me but I'm not an expert.
atb
dogsbody