Franco-Japanese. the Japanese have long looked at the French Cycletourists Racks designs..

so Nitto is one source , the rectangular sections are added to the sides of the other racks.. Nitto is into nickel plating..

Of course this could all be fabricated by the frame builder, inspired from similar sources..

the seat-tube taillight is hip on the Randonneur crowds custom bikes, I expect its an expensive combination




....