Finally saw the gun- the owner is an older gentleman who is selling off his guns- he's tired of the admin and paperwork needed for owning and using firearms here.
I did a field strip- the firing pin is fluted and unnumbered- likely a later replacement? Therefore an unmatched gun. The flute was introduced in 1935 or thereabouts? Clearly not original to this 1918.
Still, a nice gun in general. Still deliberating on whether I will go ahead.
I do see what he means with the admin and paperwork. Fees have gone up too.
Thanks to all for your feedback