What is correct crown for this 1954 cal 354 2652 GC Constellation?

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I 1471314-e8d0956d1aa18ba4e9c27b042bc36cde.jpg

any specifics which one is correct and best place to find one? Thanks
 
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Correct crown would be 42019 (thick decagonal) or 42023 (clover). eBay is probably your best bet.
 
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Thank you! I've seen some decagonal crowns with upward pointing feet which i assume are a later service crown, will look out for the flat foot logo version.