First time poster. Longish time lurker.
Picked up an old Lamy a bit ago and was hoping maybe someone with some vintage Lamy knowledge could lend some insight. Ran into a gentleman by the name of Osman at the Ohio Pen Show who said it was Italian. He fixed the sac for button filling and thought it was quite uncommon and most likely of Italian origins in the early Artus transitional period into Lamy.
Sorry in advance for lack of savvy with FPN posting convention. Attached one photo and have a small gallery at the imgur address below. Had some friends take some more pictures for me that are better than iPhone quality, but I don't have them yet to share.