Crown for goldcap ‘55 bumper Polerouter

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Can anyone help in sourcing a crown for this beauty? I know original signed ones are scarce so it doesn’t have to be one of those, an aftermarket alternative that closely resembles the original will do just fine. Anyone that can help or give me some headers? Matching the gold tone is one of my main concerns.

jNyR3x5.jpg

AXbe6Lw.jpg
 
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Also, if someone has an original crown and can share with me the defining diameters, that would be great. So outer diameter but also tap and tube.

Dimensions: Tap x Crown Ø x Pendant Tube Ø

Reference is 20214-4
Edited:
 
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I learned from the 181xxxx serial it was not manufactured in 1955, but rather 1956 😀
If someone has a good image of a fully original 20214-4, showing the crown, that would also be very helpful!
 
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Think you will have a hard time locating a correct crown. That is at least my experience trying the exact same. Think your best bet is to find an aftermarked with the right form for theese bumpers. Thats what im trying to do. Let me know if you find a better solution as im looking for the same thing.