Need Help Plating This One.

I am posting this here in this thread as I believe it to be from Plate 2. I've come up with some possibilities but don't feel comfortable enough my guesses. I lean toward 77L2 or 17L2 but

Any help would be appreciated.

Sorry, meant to post this in the 1C 1851 Plate 2 Stamps thread.

It is indeed from Plate 2--those markings in the right margin are found on several Plate 2 positions. I don't think this is 77L2, but 17L2 bears a closer look (as do a few other positions).

I had that cover on my watch list but must have forgot about it. Didn't realize it until you posted it... I have seen a few three centers from Harrison Square but not any one centers. Not sure what is on powersearch. A pretty good cover, I think.

Not a very easy stamp to plate IMO. As Dudley suggests, the marks in the right margin are very common, as they were on the relief roller.

My first thought was that 17L2 was a good match. However, I kept looking and I think I may have found a better match in 59L2. The weak right side ornaments match better and the mottled color at lower right rather than a line. I posted a picture of the lower right comparisons with Siegel 1120 lot 1087. The line at right is not as sharp but the image from Siegel's has more of a "wiped" background with more color.

Refer to the discussion here:

https://goscf.com/t/57739&whichpage=4#507090

This also looks like 54L2.

I agree txstamp. I can find no differences between mine and the 54L2 strip in your post. I can feel confident now listing it as such in my collection! Great eye!