For a collector, the Drueke boards start and finish to be called Vintage with the original company finishing its operations in 1987. The boards of the 2 companies taking the succession or the Drueke grand son were producing chess boards that are not Vintage.
The technique was close, but still they were trying to reproduce the original Drueke chess boards.
You have posted the right photos of the 2 models with straight sides and curved ones: the straight sides are not from the original company. The first board according to the photo is probably one of the grand son or in any case a board made after 1987. Generally these boards are more "white", the vintages have more patine, are more yellowish. Also the inscriptions or labels on the back of the board are different.
Mister Modoct, can you please post some pics of the original board with round borders? I have also seen vintage Drueke boards with straight borders, What's the story with those boards?