Bommer LB4300 Series Steel Spring Hinge with radius leaf and square corner leaf. The LB4352-400B was used by Peachtree Door and many others.

Application: Self Closing Door Hinge, Peachtree Door
Size: 4 x 3-3/4 inch
Hinge Profile: 5/8 Radius for Door Jamb, Square for Door Panel
Material: Steel
Finish: Bright Brass US3
Hinge Type: Grade 1, UL Listed for Fire Doors

Made in U.S.A.
Patent # 6,460,220
Markings: R-4667 653M