FINE AND RARE MINT NEVER-HINGED JOINT LINE PAIR OF THE 1915 2-CENT TYPE I VERTICAL COIL.
The 2c Type I rotary plate was used very briefly to make vertical coils issued in late 1915. It was briefly used because the Type I plate was not very deeply engraved and the curvature of the rotary press yielded impressions lacking in some of the details. The Bureau noticed this immediately, and quickly replaced it with the Type III plate (according to Scott, the EDU for No. 449 is Oct. 29, 1915, and the EDU for Type III is Dec. 10, 1915).
With 1975 and 2015 P.F. certificates