Here's your answer:
The bottom of the circular part of the indicia reads "Sec. 562 P.L. & R" (PL&R = Postal Laws and Regulations):
Quote:
From October 1, 1932 (until it was superseded in 1949) anything sent third class bulk rate had to have the phrase Sec. 562 P.L.&R. printed on the envelope, indicating the article was in compliance with Section 562 of the Postal Laws and Regulations
Just as it is today, bulk rate rate does not include a date of mailing on the piece.
As for the meter itself, it would be defined as a Pitney Bowes Type DC6(D) (Using a FV-6 type meter) based on this excerpt from the International Postage Meter Stamp Catalog:
Posted 04/29/2014 12:50 am
