Very interesting coin! I wonder if someone took an S-77 and tooled some reeding onto it. @John Wright let me know what you eventually think of this coin. If it is a legitimate reeded edge, that would be an amazing find, and I would have to update my book accordingly
The TPGs usually lack the expertise to verify new variety discoveries. That is usually done my the related organization (EAC), which the TPG will refer to to certify the coin
I sent John Wright's email to Phillip. Personally it looks to me like an S-77 struck on an older "lettered edge" planchet that wasn't run through the Castaining machine to apply the edge lettering. The vertical lines on the edge are not reeding or milling, they are the shear marks from the punching out of the blank from the strip. Since it wasn't run through the Castaining machine the shear marks were not flattened out. Harry Salyard (Editor of Penny-Wise, the EAC journal) has/had a similar piece of a lower weight.
The more we look at the coin and compare to a S-79 . This could be a one of one S-77 . Now the next step is verify.