What is the relationship between Fiyta and Longines?

It doesn't matter.

Fiyta and Longines are two different watch brands, and there is no direct relationship and cooperation. Fiyta, full name of Fiyta Precision Technology Co., Ltd., formerly known as Fiyta Co., Ltd., is a watch company listed in China, established in 1987 and headquartered in Shenzhen. Longines was founded by August Agassi in 1832 in Soymia, Switzerland. Longines is a famous brand of Swatch Group, a world famous watch manufacturer. Longines watch is marked by flying wing hourglass.