seeminly an uncommon f.p. - it appears on John Brindle's M.T/Swan list although only in Burgundy and Florentine Blue - the reason possibly being that by c. mid 1950s the twist fill system lacked appeal - unfortunately the bar is missing in this pen.
I had a quick look on the screen, but very little seems to come up for the 'York', and this is the first example I've found.
Twist bar aside, the quality of the pen looks reasonable - it may well be BHR, as there was an absence of celluloid smell when I was cleaning the barrel and cap.
Despite what the chalk mark says, I think the nib was changed at some time, certainly the tip on the nib looks to my eyes wider than a 'medium' - but it's smooth and has some flex, so really a very charming little No. 1.
Unfortunately the blind twist button moves very little, and doesn't want to retract fully to match with the end of the barrel - I might delve deeper to see if the problem can be remedied. The g.f. on the clip is largely intact, and despite the Brindle list implying that all trim was g.f., the clip screw is a chrome job - but looks good.
Edited by PaulS, 28 November 2017 - 12:52.