Guy:

In his 1993 RMJ article, Martin gave the sale date as 1931.  Hendrickson and Kaminski's billboard reefer book gives it as 1930.

My 12/30 ORER doesn't exhibit any hint of the sale, but Swift is clearly listed under GA by 7/35.

I can't offhand recall any other sources on this question.  

With best regards.
--
Dave Parker
Swall Meadows, CA