Scott 452 With Stitch Watermark?

Spotted it quite easily from the front of the stamp. Is it something else?
I was under the impression that WM fluid is required to pick it up.
Thank you again.

IMO the markings are from an external mechanical force such as a piece of mail handling equipment or stamp dispensing machine (it IS a coil stamp). It is not however a watermark.

Look at the perforations. This coil was most likely handled by a machine that attached the stamp to a letter, and the knife that cut the coil off was just slightly mis-adjusted


Peter

Interesting. So, similar to private perforations, where stamps were dispensed out of privately-owned machines? Or some kind of technical malfunction?

I see Peter. I have a hard time visualizing what you mean. I'll have to research it.

They are gripped marks, used to advance the coil stamps in the dispensing machine.
Don

Interesting! I haven't seen/heard anything like that before.
Incredible, Don. Thank you

As Don noted, marks from vending machine (not an affixing machine). The topic has come up before with other illustrations. To cite one:
https://goscf.com/t/83223

Add:
Lobbies in post offices, depots, hotels, etc., had vending machines. Insert a nickel, turn the crank and get a strip of five 1-cent stamps. The crank advances the stamps with various internal gearing and rollers which create the indentations. The strip would be knife-cut at each end of the strip by the vending machine. Note the knife-cut at the left and natural tear at the right. Very common on 1 cent stamps as this matched the postcard rate. Less common on 2-cent stamps. Most stamp collectors would consider your stamp damaged, while specialists (perhaps read this as "postal historians") would consider these marks as evidence of the postal and vending technology of the times. The market price falls toward the "damaged" end of the spectrum.

As opposed to stamps which passed through an affixing machine, which are typically knife-cut along both sets of perforations and won't show any roller indentations.

Thanks John for explaining the difference between 'vending' and 'affixing' technology