Originally Posted by
LesterOfPuppets
The one in that pic looks like a clamp FD. OP's may be different, however.
Also, it's possible to get a top swing FD clamped below a road FD tab, esp with 42T big ring. Bigger rings would increase probability of small ring being locked out because of FD hitting the FD braze-on.
I owned a KG381 and also a couple of 481SL's They all had braze on derailleur hangers. The seat tube is not round at that point so you cannot use a clamp on front derailleur. Forget about using any mountain bike front derailleur on that bike