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The one pictured is of the #tester_approved design, I usually suggest the BBB version as it's widely available which is so similar that I wouldn't be surprised if Mason had gone to BBB's OEM department 🙂
Mason seatpost clamp just let go. (hot tip: don't work on bikes before coffee and remember the wrong bike's clamping force - Mason is 4Nm)
Before I get another of the same, didn't you used to have a thing for a particular brand/design of clamp @gbj_tester ?
https://masoncycles.cc/products/mason-macro-seat-clamp-31-8mm
Actually my seatpost clamp doesn't have those two bits of cylindrical steel - it must be an older version.