You will find that the Potter & Brumfield sits flat, with even gap on the plastic housing.
Potter & Brumfield R10L-EI-X4-V2.5K-48VDC Relays New Old Stock R1OL-EI-X4-V2.5K
A nice touch is the Potter & Brumfield brand plate, which gives the relay a classic, no-nonsense look.
What stands out about this unbranded relay is that the pin layout is printed right on the top for quick reference.
What stands out about this model is the Potter & Brumfield build quality and tidy lead forming.