1cent Washington Help

Hello All-

New to the community here. I recently acquired the two stamps shown below and I've spent some time trying to identify them. From the vast resources on the internet I think I have come close to identifying them. There are two pictures of the front and back. They are the same stamp, just different lighting for the pics. Here is what I have so far:

12 x 11 perforation
1912-1916
A140
No Watermark
Intaglio Offset Printed
100% Wood Pulp Paper
#462a 1916-17 1c Washington 6 pack booklet

I would be greatly appreciative if anyone can verify my identification or provide the correct one if mine if off base.

Thanks in advance!

Washington not Franklin
Perf 11, from a booklet pane of Scott 498.

This is a perf 11 pair from a 498e booklet pane. The stamps should be unwatermarked. I count 11 perforation holes and 10 perforation tips between the left and right edge of the design. The width of each stamp is slightly less than two centimeters making it possible to determine whether the stamp is perf 10 (10 holes or tips), perf 11 or perf 12 (12 holes or tips). While not an exact science, it should be possible to determine the perforation spacing of any stamp if the width or height is known by counting the perforations and applying a formula as in the following example.

Without accounting for paper shrinkage or design stretching if a rotary press stamp, the nominal size of definitive stamps of the period was 3/4" x 7/8". Since booklet pane stamps shrink in the vertical direction, the stamp designs are 0.75" wide. The perforation count is 10½, The width of the stamp is 1.905 centimeters. The perf gauge is

10.5 * 2 / 1.905 = 11.02362

close enough to nominal perf 11 and good enough for a quick visual determination. Keep in mind that a perforation gauge is not a measuring device. The actual hole spacing for flat plate perf 11 is 0.072". The number for perforations expected in a 0.75" interval would be 10.41667 confirming the approximate result above.

Counting the number of perforations spanning known intervals can be used to avoid guesswork.

Thank you all for your replies! Even though I did not hit the dollar jackpot with this find I greatly enjoyed the hunt for the facts. You have a great community here; keep it going :)