OliMadeInBelgium
On Training Wheels
I did a search for the builder, Oscar Borghys, and came up with this thread as the first result.. There is not much online about this legendary builder.
Edit: Perhaps @juvela might have some insight into the OP's bike in the first post?
I agree, this bike does look more like a 1930's balloon tire bike than a WW1 era machine. Wide fenders, wide tires on drop-center rims, tubular steel rack, etc, all features found on a bike that is roughly two decades newer than the claimed 1915 date.
Here is a 1915 Triumph roadster from the Online Bicycle Museum. The typical features of a 1915 era machine are readily apparent compared to the OP's bike. I don't think we need to be experts on Belgian bicycles to see the issues with the OP's sale ad.
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1915 Triumph Gloria Roadster – The Online Bicycle Museum
1915 Triumph Gloria Roadsteronlinebicyclemuseum.co.uk
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Thank you for all these comments and information. The museums I contacted pointed me towards this date (1915). I am currently conducting more detailed research to see if I can use products to reveal other details, such as a number under the pedals. Until I have the results, I will correct the date. Thank you for your valuable advice.


















. There is not much online about this legendary builder.


