NOT KNOWN DETAILS ABOUT SILVER SUPERSONIC PLANE COIN

”  Other microprinting about the plane incorporates “X-1” about the horizontal stabilizer with the plane as well as a horizontal row of three “USPS” letters representing the plane’s pitot tube. Repairs took a number of weeks to accomplish along with a 2nd flight was scheduled for mid-August. On 22 August 1951, the X-1D was missing wit