Interesting piece Fernando, The font used on the end of the muzle, bieng totaly sans serif dates post late 1870s when it first started to be used, as far as my observations have taken me. {other than on fake markings of course.} {But such font was still rare untill the 20th century.}.}
The "perhaps" older font used on top of the barrel is clearly done with individual stamps,
i have no evidence otherwise for york mail but as the average wood worker could afford stamps cut by an engineer of there entire name, I suspect York Mail could as well. {Especialy as many such stamps were actualy made in Sheffield, Yorkshire.}
I vote XXI century For the markings, I am not capable of dating the piece itself.
Spiral
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