Personally I wouldn't bother.
It is very expensive in the state that it its it will take a lot of work and money to make it playable and probably will never be worth the fuss or money that you put in it together with the starting price.
These Schenkelaars are the most puzzling of all.
They are not Orsi or Keilwerth or Arta Guban stencil and they appear to show some features common to Bohemian saxophones such as the pinky table.
However they have differences too. They may have been made by Dörfler & Jörka or with D&J parts or inspired to those (and a few more other brands too).
The rolled toneholes have incredibly thin rolled portion and I have seen them also worn out .
Whether they were assembled in the NL from bought pieces or made in Holland remains to be seen.
Often they are punch tamped Made in Holland somewhere (I don't see the eagle anywhere in the pics but it is totally immaterial seen the above considerations and the fact that I see tons of these in the NL without any eagle).
They are fairly common and often times fail to sell or sell for very low prices.
Here they have no market at all and only lately a few buyers resellers specialized in the low end market have taken to buy them for less than €100 if at all.
In view of this, the asking price is simply ridiculous.
I would stay very well away from it.