A nice touch is the clear printing of model 31016, helping you match it to your documentation without confusion.
LINE ELECTRIC MKH3A RELAY 115V UNMP
this particular relay carries the Functional Devices, Inc. name, which many electricians trust for daily work.
With the DEC DU1PU 24VDC 16A 250VAC relay, you get clear ratings printed right on it.
This relay bears the AMERICAN ZETTLER / MCE mark, a name that has been around for quite some time.