Vintage FB Fratelli Brivio Pista Hubs
High-low flange.
What would be the advantage?
The force used to start in a track race is enormous so the short spokes
give a higher stifness, more solid.
Also Campagnolo later had this kind of combination.

Vintage FB Fratelli Brivio Pista Hubs Italy.
"Nec plus ultra ..."

Vintage FB Fratelli Brivio Hub 1949

Vintage FB Fratelli Brivio Hubs NIB (New In the Box)

Campagnolo and Brivio worked together in the late '40ies in Cognin, France.
The reason why the text on many boxes were in French and not Italian.

 Vintage FB Fratelli Brivio rear hub
with original  quick release Campagnolo

 Vintage FB France wooden rims

Vintage FB Fratelli Brivio Hubs 1937?