A nice touch is the Potter & Brumfield date code, which helps with traceability during maintenance.
(44) AMF Potter & Brumfield T90N1D1215-01 Relays 240VAC 30A 15Vdc Coil – NOS
What Potter & Brumfield unit is the clear polarity marks on the coil.
What stands out about this model is the Potter & Brumfield build quality and tidy lead forming.