[QUOTE=baumgrenze;20671163]...Please help me with terminology. A search for "5V gear block" returned nothing of use to me.[.../QUOTE]
5V = 5 Vitesse (French) or 5 Velocita (Italian) , both of which translate to "5 speed" and refers to the number of cogs typically found on a freewheel used with hubs having a 120mm OLD (Over Locknut Dimension).
I think these hubs look a like a Pelissier product.