In 1863, 152 years ago, January 31 fell on a Saturday, This year Jan. 31, 2015, falls on a Friday, but it is nonetheless the 152nd anniversary of the first known day Sam Clemens signed a letter "Mark Twain." He sent the letter up to Virginia City from Carson City on the Stage, arriving there Sunday morning. The Territorial Enterprise typesetters and printers did not work on Sundays, so there was no Monday morning paper. The letter appeared in the Tuesday, Feb. 3, issue.* Bob Stewart *the date of publication is inferred, no copies of the Feb. 3 or 4 Enterprise are known to exist, only the clipping, in Twain's scrapbook. The letter itself is dated in type.