Omega Speedmaster leather straps manufacturer question

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Hi!

I have bought an OEM leather strap from my watch maker who has access to the omega serviceparts catalog. The strap is called Karibu and is in black grained leather and has the ref nr 97631079 20/16. I order it because I will put it on my 3590.50 from 1991. I have seen photos from 3590.50/3890.50 from early 1990s that has the same kind of strap however worn bu they look similar. My new strap has a stamp on the back that says GIF. Do any one know who made these straps for Omega, if it is a NOS strap from the 90s still in stock as a spare part. My watch maker found it when searched for bracelet and straps under the ref ST 145.0022 that was the name for 3590.50 that was sold on leather.

Thanks in advance