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Okwaho, I was referring (re: Lenk) to the Tulle guns in my note above--Lenk does not discuss them (other than slight mention) nor illustrate them. The original question was about Tulle guns. I have no doubt that Lenk's book is a classic on French flintlocks in general (although a tough read, being poorly translated from the original Scand. language and the pics being poorly linked into the text). My comments stand: if you are interested in learning about Tulle guns, per se, go elsewhere.
As to Liege guns, I came across an old (Feb 1998) MuzzleBlasts article by Shumway which illustrates a Liege trade gun dated 1732 signed by a known Liege maker of that period that I thought quite instructive. It had a serpent sideplate (in iron)and a short barrel which he thought could be original. It had a banana shaped lock. It was smootbore .68 as I recall.
As to Liege guns, I came across an old (Feb 1998) MuzzleBlasts article by Shumway which illustrates a Liege trade gun dated 1732 signed by a known Liege maker of that period that I thought quite instructive. It had a serpent sideplate (in iron)and a short barrel which he thought could be original. It had a banana shaped lock. It was smootbore .68 as I recall.