Is This A Scott 10 Or A Scott 11?

For today's 'what the heck?' cover (see below) I could use some help in identifying the stamp. The cover was mailed, according to docketing, in 1854, from Plymouth, MA to Burlington, VT. The stamp is tied by a nice, blue Plymouth cds next to which is a black Burlington cds presumably applied when the cover was forwarded to a town I can't decipher.
The stamp clearly has only single vertical frame lines, making it a Type I, either a 10 or 11. The color just doesn't look right for a #10, but... the #11 wasn't issued until July of 1855, a full 7-months after the docketing on the envelope.
So...I'm looking for a opinions. Is this a #11 with bogus docketing? Is it a number 10 even though the color is a bit "off?" Any help greatly appreciated !!

It looks a bit like a #11, but also looks like the stamp was applied at a later date and was not the original stamp on the envelope.

The final destination is Port Kent, NY.
A very nice example showing both the prepaid and unpaid rates on a single cover.
(but add, I agree does look like a "MAR" date on the stamp. Oops.)

Agree

Good eye, gents! That possibility hadn't occurred to me (and should have!). Running the image thru Postmark Reveal shows the stamp's cds with a date of 'Mar 26' confirming it couldn't have been applied in December as the docketing states (probably after some sport soaked a #10 off of it). And that's in addition to things not lining up quite correctly.

Stamp appears to have a Baltimore CDS, a clear mismatch to the Plymouth CDS.

Bottom line: your stamp's plating should be done without any regard to it being on cover.

I'm still just a novice at plating these 3c but I have found the 11s that are A reliefs from plates 6,7 and 8 are a challenge to plate even when you have all four frame lines. This one's missing the left and top and some of the bottom. Not an easy one to plate.

Hi docgfd --

I agree with Harper's comment that your stamp is not an easy one to plate -- as it is missing pretty much 3 of the 4 frame lines -- with the only complete frame line being the RFL.

But on the other hand -- the LFL of the adjoining stamp at right is pretty much complete -- and I noticed a faint guide dot on your stamp -- which is well outside of the RFL.

Between the guide dot positioning and the two fully visible FL's I plated your stamp to position 63R6 -- which makes it a Scott #11.

As an aside -- The earliest known use for plate 6 is February 18, 1856.

Regards // ioaoga

Sorry docgfd, I completely butchered my analysis on the relief. Its clearly a B relief with guide dot.

Harper1249