This is a nice old style milled steel Lyman 17A front globe sight for sale. It came off an older 1970s era Marlin rifle and is the AHB model the lowest made at .404" high. The sight is cut for a standard 3/8" dovetail.
Nice condition- no rust. Flat topped blade insert included. Most place these are $35 to $40 shipped. My price is $19 shipped via US first class mail. Price is firm- PayPal only as payment. Thanks.