George,
I'm surprised you don't know all about the Parker Invincibles. There are 3 known to exist and owned by the late Robert Peterson who was a magazine publisher. They are currently on loan to the NRA National Firearms Museum in D.C. They have been displayed in the last few years, two that I recall were the Old Baltimore Gun Show and the gun show in Chantily VA.
Do a google search to learn more.
Regards,
Chuck Bishop
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