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I found some info on the Rene Herse site useful last night, although they said:
'This fender (Berthoud 650b x 50mm) is our most popular 650b fender! It is priced below the Honjo models, but while heavier, its material we think makes it more robust. Perhaps even a safer choice as these are quite stiff and less likely to fold up upon contact with debris. But that is just a guess. Plus - Berthoud hardware is fantastic!'
Honjo (and Velo Orange) guards have nicer fitting hardware than the GB...