How would I verify that Conn F- 60 – 6 string & Conn F-65 - 12 string were made at the Harptone Facility

Does anyone have knowledge about guitars made at the Harptone Facility in Newark, NJ. I did an Internet search on my Conn F-65 12 string.  I found a website maintained by a Conn guitar enthusiast named Joseph Brock. On Mr. Brock’s website he posted that Conn F- 60 – 6 string & Conn F-65 - 12 string guitars are solid wood guitars & were made at the Harptone Facility as prototypes. All other Conn guitars were manufactured in Japan. I sent some family pics to Mr. Brock of us playing the Conn.

I hale, originally, from the south end of Bloomfield, NJ. I have no intent on ever selling the guitar because of the sentimental value. Also, the most anyone has every paid for a Vintage Conn in the F-60 series is $400. Both my sons discovered their love for guitar playing it. If the guitar was made in Newark, so close to where I grew up, it would add even more to that sentimental attachment.Any suggestions as to how I could verify if the Harptone for Conn F-60 & F-65 connection is true?