Dorotheum in Vienna have some interesting hirschfänger in auction now. remember the blade lenght of a Hirschfänger is not clear, its between an sword and knife.

62 cm long blade https://www.dorotheum.com/de/l/8934869/

83 cm long blade, old epee blade https://www.dorotheum.com/de/l/8934881/

36 cm long blade https://www.dorotheum.com/de/l/8934878/

13 cm long blade, not a hirschfänger anymore, hunting knife https://www.dorotheum.com/de/l/8934887/

the hirschfänger was the insigna of the forester and part of the uniform like the sword of an officer.
it show the forester was a "Hirschgerechter Jäger" - I try to translate it - a Deer-legitimate Hunter.
this came from old times also in the 18. century when this science reach its peak, it was the old school how to hunt the deer like you learning a craft for years.