I typically can't stand a butterfly, but found this Rios Clasp made in Germany very easy to put on without having to bend the strap to go through the keepers and it's the German high quality you'd expect. Evitzee is right on, I paid around $40 bucks on ebay for it. I especially like the large screw head that holds it to one side of the strap instead of the pin for security reasons and it lays very flat.
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