Rixson 3/4" appears to be a replacement for Dor-O-Matic and Glynn Johnson 3/4 Pivot hinge

Product Description & Features:

Mounting Leg Length: 4-7/8 inch

Mounting Leg Width: 1 inch

Used when frame condition does not allow standard top pivot

* Lateral load-bearing

* Maintains door alignment

* Aids in installing floor closers and bottom pivots

* Heavy-duty needle bearing

* Non-ferrous base metal

* 3/4" (19mm) offset standard

* Available for 1-1/2" (38mm) offset

* Available for fire door assemblies (ferrous material)

- specify FM190

* For 20-minute label suffix "-20" to part number

* Doors 60" (1524mm) to 90" (2286mm) in height should use one intermediate pivot. Each additional 30" (762mm) warrants another intermediate pivot.

* Door edges must be beveled in 1/8" in 2"

* Furnished with wood and machine screws