Suspect Scott #351, Used Single (5/10/15).
This coil is often faked he catalog price for an used HH #351 is a modest $300.00 and can be faked by adding perforations to #347, #347E or trimming perforations off of #335.
The watermark is double line “S” in the upper right corner and “P” in the lower right corner, are reversed and read horizontal.
The width of the suspect is just over 20mm at the top and bottom which is a long way away from the ideal width of 21.55mm. The two cut edges are not straight but wavy.
The top perforations gauge out to 12.015 and the bottom perfs gauge at 12.000.
As can be seen there are gross fit problems with the top perfs and subtle fit issues with the bottom perfs.
Conclusion: In my opinion the suspect is a trimmed #347 with fake perforations added to the top and bottom.
Reference material used:
As always comments and suggestions are always welcome.
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