Underlever,
I would love to see some pictures of your Guyot.
He is one of my favorite Parisian maker / retailer.
Some of his stuff is easily comparable to Purdey.
I had a shot (pun intended) at a Guyot 500NE double, but the bores were ruined, so I passed on it.
I wish I could find one in great shape.
WC-