Prototypes and early models
The early models of Kaweco, within the timeframe that I'm considering, are quite unknown. I could find some of them but the information is not abundant.
Metallic Lacquered Prototypes
Kaweco Prototype Green
Kaweco Prototype Gold
Kaweco Prototype Blue
Kaweco Prototype Purple
Kaweco AL Sport Chiseled
Kaweco AL Sport Chiseled (2 wavy lines)
Early versions (without Kaweco Sport imprint)
Kaweco Sport "Black with silver pattern"
Kaweco Sport "Soap Green with "Keith Haring" imprint"
Trekking, Ranger, Yacht Sport
Kaweco Trekking Sport, Kaweco Yacht Sport and Kaweco Ranger Sport
(image from Kaweco-Sport-Historie.pdf)
Kaweco Ranger Sport
Kaweco Trekking Sport
Kaweco Yacht Sport (image from Kaweco-Sport-Historie.pdf)
Kaweco Sport - unidentified series - (image from Alf Jung, edited)
Early Kaweco Sport with unusual pattern. Unknown series. This pen is engraved "KawecoSport" on the cap and has chrome trim.