Possible Variant of 64th Regiment Button

[Old Dude]

Hi members. This is my first time posting in this section of the forum. I was directed here by another member in hopes Mr. Troiani or another knowledgeable person might give some more information or facts on the legitimacy of this find. The button was found on the site of a very historical property in Philadelphia that has been graced by the stay of George Washington on more than one occasion. It was built mid 18th century and has been the site of a few reenactments. It does give up period relics and coins as well as reproduction items.
The button itself was found under a root of one of the huge trees lining the carriage paths and is not magnetic in material. It is 23mm and weighs a hefty 12.9 grams. The weight alone made my detecting partner there think it might be real. He has seen many buttons from the site but never one like this one. The shank looks to have been drilled but does not appear to be an exact match for buttons in Mr. Troiani's book. Please feel free to offer advice or suggestions.

 

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[Old Dude]

Update. Mr. Don Troiani replied to an email I sent him and says it is 100% a reproduction button. Thanks to Iron Patch, Steve in Pa and Mr. Troiani for their help in this matter. My oldest copper is English. My oldest silver is English. I really hoped my oldest button was English as well since my GF's old regiment in England happens to have been the 64th. Thanks to all for looking and good luck!