Barry K. John lists Arlen 1001 as being from 1963, with a question mark next to the listing meaning he wasn't sure. This sounds earlier to my ears. I'd guess 50's. He also mistakenly listed the label as being the same as Arlen from Pennsylvania, which it is not.
Arlen 1003, 1009, 1010
Label location: Culver City, California
Pressed by: ?