1-9/16" overall with 7/8" ferrotype portrait at front center. Ferrotype is exceptionally bright and clear with just a couple of tiny marks showing to the naked eye. These are a 1/16" mark on the left at his cheek, a 1/16" line above his hair and upper edge has a 1/16" and a pinpoint dot of emulsion gone. Under magnification the tiny mark by his cheek extends in a hairline downward and across his beard but with normal viewing this doesn't show at all. DeWitt lists this piece as being in silvered brass but this example has the entire finish in brass without silvering with the exception of the narrow slide on the reverse designating the days of the week. Front of the piece has slogan along with name of maker and reads "The Constitution And Union Forever/W.C. Ellis/Springfield, Mass." Reverse shows a calendar with 31 days above a small image of a sailing ship with a paddle wheel on the side. Above the calendar is a curved cut-out marked with an initial for each day of the week and this can slide to line up with one of the first seven numerals of the calendar. Text reads at top "Perpetual Calendar" and around the lower edges "Entered According To Act Of Congress In The Year 1853 By S. Smith In The Clerk's Office Of The District Court Of Mass." Reverse has couple of dark dots on the brass finish mostly around the outer perimeter. These calendars with large ferrotype images are rare and quite desirable. We know of four examples for Grant. A matching Lincoln exceeded $20,000 in the sale of the Zabriskie collection.