unbranded YG crowns - please see photos

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Dear forumers,

I am looking for yellow gold unbranded crowns like the ones in the attached photos:

required:
diameter 5.5 - 6.6 mm
slim shape
roughly serrated
smooth surface without any ridge
ever so slightly domed
completely flat on the back
for stem-size 1.2 mm
yellow gold "capped" not only electroplated

NB: I know the offer from ebay seller pedometer but these are worthless for me as the gold colour is far too pale
colour should be a deep yellow not pale as the one listed on ebay atm.

Edited:
 
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Belive you find some whit Mateus in London
_thetimekeeper_ on Instagram.
 
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Watch part houses are full of such things. Where have you looked so far?