Another Beautiful Antique Brass Stencil Wheel, Allen Bros., 1868-1871 Patent

I keep scooping up these antique stencil wheels whenever I come across them  as I think they're just fantastic things. This is a very early one, with 1868 and 1871 patent dates (stamped on the face not once but twice) as well as a stamp for Allen Bros. Boston, MA, who would have been the distributor. In the case of this one--which is in very good shape, with a nice warm, mellow patina to the brass on the face --I love the back side as much as the front, which shows pretty amazing greening. Completely useable should one want to put it to work again.  There were a few different sizes and variations of these made; this is the largest I believe, including all the letters and numbers as well as handy extras (lbs, yds, $, etc.) Held together at the center with a turned wooden handle, the arm on top rotates easily around the disc, with two windows for framing the letter or number to the be used.  14 1/8" across at arm; the disk itself measures 13 1/8" across. Very good condition, with a mino