Here is what only appears to be a Finn Juhl FJ-49 Chieftain chair marked by Niels Vodder. Quittenbaum auctions sold it back in 2013 for 16 thousand euros. That is a lot of money to burn on a fake, even if it was a small price for what a real chair would have sold for.
The mark looks a lot like a real Niels Vodder mark, but it is not. Compare the letter spacing and such.
The chair looks a lot like a real chair, but it is not. Here is the big tell. In the 1980s, Niels Roth Andersen re-released the chair, and innovated the curved joint at the top of the leg, underneath the horns. Niels Vodder made his last Chieftain chair, with a square joint there almost 20 years before that. So this chair references the Chieftain design as it was made no early the 1980s.
There are a couple of other less obvious major flaws that show the chair is not authentic. The seat is attached to the frame with brass clips in ALL authentic production through the years (Niels Vodder, Ivan Schlechter, Niels Roth Andersen, Hansen & Sørensen/OneCollection). The armrests are attached with bolts through the wooden underarm and the nuts hide underneath a little cover strip sliced off the bottom of the underarm. The wooden underarm here is one piece, no little cover strip at the bottom. So the armrest is attached through some other means.
There are a lot of other little flaws if you look closely.