Circa 1860s cast iron Eagle Lock manufactured by Russell & Erwin.  Lock box measures 5" tall x 3 5/8" wide.  Offered as found and uncleaned.  Lock is covered in many layers of paint.  Screw holding plate on backside was replaced at some point in time.  See images.  Lock plunger operates as expected when knob is turned.  Additional pictures and measurements available upon request.  Please ask all questions prior to bidding. All sales final.  No returns accepted at this time.  Please check my other listings for additional unique offerings.  I will be uploaded a lot of antique hardware over the next couple weeks.