3c Perf 10 Rotary Coil Washington Franklin Stamps

Watermark and Type Check - The rotary press, perf 10 vertically, coil stamp must be checked for watermark and Type. The perf 10 horizontal stamp must be Type I, US 489, and is always single-line watermarked.

Coil Type	Printing Method	Watermark	Type	US Number
perf 10 vertically	Flat Plate	single-line	I	445 (see caution)
perf 10 vertically	Rotary Press	single-line	I	456
perf 10 horizontally	Rotary Press	single-line	I	489
perf 10 vertically	Rotary Press	none	I	493T1
perf 10 vertically	Rotary Press	none	II	493T2

Caution:

US 445 is often faked by cutting off the perforations on a Sc426. The fakes usually measure smaller than the desired 25mm tall and are therefore not very convincing, but taller fakes can be a problem. Taller fakes can also be made from the imperforate Type I stamp Sc483. Although this stamp is unwatermarked, it may pass detection if the watermark is not checked and be aware that fake watermarks do exist on this stamp. We would advise buying US 445 only from reputable sellers. Better centered copies and line pairs are particularly suspect, we would recommend buying or selling these only with certification. In all cases make sure the stamp has a single-line watermark.