I have and have had hundreds of straps from all manner of different makers. Without question (IMO, of course) the absolute best of the best is Cordes.

His straps are meticulous. The stitching is always perfect – as is the fit. His stock of leather options is vast and always includes ammo variants.

I have no affiliation other than being a fan and consumer of his work.

He produces straps in a bespoke manner so if you have specifics he’s more than happy & capable to accommodate.

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The BEST Handmade straps for Panerai are by Cordes.