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the lug pattern appears to be BOCAMA Nr. 110/II with added cutout...or it may be a BOCAMA 210/II (not shown in me catalogue)
all braze-ons are likely post-manufacture additions
the combination of BOCAMA lugs with Maeda dropouts is suggestive of a low countries origin
fork appears to be an off-the-shelf Tange Mangalloy
serial placement and format a helpful clue toward an identification of maker
try looking at some of the major marques from Belgium such as Flandria
you may find a match in a short time
date guess: ca. 1974
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tip - suggest first thing is to verify tubing diameters and threading
a Swiss product of this era would be produced with metric tubing
a product of the low countries is overwhelmingly likely to be done to BSC standard although there were a few makers who employed the metric standard
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Last edited by juvela; 01-22-22 at 03:29 PM.