My '75 S-10S still sports it's original Fujita Belt saddle as well. Great seat! That seat and my seat came to an agreement many many miles ago.
If I put a Brooks tag on my Fujita saddle, that would be a 'fake'. How many makers/brands were there ( or are there) of leather saddles? As long as they are not trying to pass themselves off as a Brooks, they are NOT fakes!
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time