16mm rose gold tang buckle

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The title says it all. This will be for a vintage IWC, but I'm not shelling out $$$$ for an IWC-branded buckle. Generic/unbranded or other-branded will do---am just hoping to (eventually) replace the cheap plated one that comes on the 18/16 strap I've ordered with one that's actual 18k or 14k rose/pink/red gold. (IWC's rose gold skews red; I don't expect an exact color match, but am not interested in yellow gold.)

If you've got something, let me know! I'm in the US and would prefer a domestic purchase, but am open to international.

Pin buckle is what I'm after, but will consider a deployant if it's not crazy expensive.

Should add (to preempt the awesome helpful generosity of my fellow OFers) that I am aware of Ofrei, and am considering just ordering one of these. But am curious to see what else is out there.
Edited:
 
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Nice piece, but I'm not looking for gold-plated, and I don't believe that's oem IWC, is it?