1917 no.1 mk.3 markings

[Thunderbox]

Its a "star in a circle" over "PSF", which is a post-1951 Italian proof mark issued by either Gardone or Brescia proof house.

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[jmoore]

I would concur with the Italian origins of the marking. Have seen similar recently.

[Jdun]

That would fit with what I've been told by the dealer, thanks for all the replies

[Jdun]

I meant to ask in my earlier post, what does the V mark on the knox form stand for ? I've googled it a few times and can't seem to find an answer
Thanks