Apropos of the discussion by txstamp to my posting above, here is a printed circular bearing what I take to be 69L1E (mark in O of ONE, "walking stick" to the right of Ornament R1). The only marking is an untied 11-bar square grid killer, used in New York City beginning in 1851. The circular, a prices-current list, is dated February 1 1851. The item is docketed July 22 1851, making this an apparent first-month usage of the One-Cent stamp, at least five months after the circular was printed.
The stamp isn't tied but the cancel is definitely from the right period. Also, with the prices current, it is common for this to only be cancelled with a killer and no CDS.
This also illustrates plainly why a circular cancelled only with a killer - one simply cannot prove the exact date of mailing - at least not without help. Circulars are often mailed well after their printed date.
Today I ventured out to a stamp bourse, the first in-person philatelic event I've attended in over 2 years. There I acquired this piece from my favorite dealer, Paul Weiser of Long Island Philatelics. It is a #7 pair, 28-29R1E. It has a lovely blue shade, noticeably darker than the soft pale pastel-like blue most commonly found with Plate 1 Early stamps, and probably was used in late 1851 or early 1852.
dudley - Your pair is excellent with a sharp impression and great margins. I find it very hard to find examples of 1E that nice.
I did buy a single recently from Art Miller. It wasn't plated or even ascribed to 1E, but the impression looked so good that I wanted it regardless. After receiving it, I plated it to position 28L1E. There is a distinct mark in the "C" of "CENT" that I can't find in any other "B" relief.
dudley - Thanks for the quick correction. You are undoubtedly correct again! This is beginning to be embarrassing for me! I just got lazy in this case - I and can only look through just so many Neiken maps and Doporto examples before I give up. In this case it is inexcusable, however, in that all the elements of Doporto's 86R1E match my stamp. At least I got the plate right.
It's ironic, because I just bought another 86R1E (at least it is listed as such) at the ongoing Kelleher sale. It has a blue cancel that partially obstructs the markings in and below the "C", so I'll have to wait until I get it to confirm.