The firm of Sedgley Inc of Philadelphia was a gun company involved in many aspects of the industry. They made rifle barrels for the US military, they made the rather goofy “Glove Guns” for the US Navy, and they did a lot of commercial gunsmithing, including high-quality sporter conversions of military surplus rifles.
This particular rifle is a .22 caliber Model 45 from Sedgley, which does not appear to have ever gone into mass production. It is interesting for it’s bolt mechanism, which is a typical semiauto blowback type. However, its handle allows it to be locked in the closed position for each shot, effectively turning the gun into a bolt action. It also has an uncommon style of safety, which is a lever that slides under the trigger to block its movement. Overall, a .22 with some interesting and rather uncommon features.