German markings can be quite complicated at first.
A German "fighter squadron" or Jagdgeschwader was more like the size of an RAF or USAAF "wing"
Each JG had maybe 3 Groups
Each Group would have a staff / command flight at the top called a Stab.
Each Group would be subdivided into something like 4 Staffelen
Each Staffelen would be made up of 3 or 4 "schwarm" or flights of 4 planes (NB: each staffeln is about the size of an ALLIED fighter squadron!)
Each Flight would be divided into pairs (rotten)
Behind the "cross" you have the GROUP marking
Before the cross you have the STAFFELN ID and / or if your command /staff status if any
Each Staffeln was colour coded.
On the nose or side you would have the JG identifier "logo"
The markings in this picture show its "2 Group, 2nd Staffel, Plane no. 7
To actually answer your question, this was originally a Spanish built Buchon converted into a G4 with DB605A engine.
https://www.flyinglegends.com/aircraft/ ... -fwme.html