B68-449 TRY SQUARE ACCESSORY. Prescott Patent. Patented 7/3/1883 by Edwin Prescott of Arlington, MA, and manufactured by Stanley as an attachment to its squares to enable the user to draw angles. This one is attached to what looks like a 9" Stanley No. 20; accessory is marked only with the patent date, user initials punched into handle, Wood has light wear, blade oxidized. Rare. From the collection of Steve Dice. Good+ 150-300