Suspect Scott #350 Used Single.
This coil is often faked the catalog price for an unused HH #350 is a modest $140.00 and can be faked by adding top and bottom perforations to a trimmed #346, adding horizontal perforations to a #346V imperforate coil or trimming perforations off the left and/or right edges of a fully perforated #334. There is no booklet stamp from which to fake this issue.
The watermark is double line “U”, reversed, inverted that reads vertical. (Fig.1).
The width of the suspect is 20.5mm at the top and bottom which is way off the ideal 21.55mm, slightly less than the ideal height of 25mm but according to The Experts Book height is not a determining value for the #352. The edges are not evenly cut and are not parallel with each other of the frame. (Fig. 2)
Fig. 3 and 4 show the suspects perforations overlaid on an Instanta perforation gauge. The top perforations gauge out to 11.96 and the bottom perfs gauge at 11.955.
Fig. 5 and 6 show the suspects perforation overlaid on genuine #331 perforations.
Doing a flip comparison of the suspects perforations reveal a perfect match - Fig. 7.
Conclusion: Conclusion: In my opinion the suspect is a #334 with the perforations trimmed off of the right and left edges.
Reference material used: used:
As always comments and suggestions are always welcome.
To Contact Riverside Stamps: