Hi Mark,
Usually the SAMS Photofacts were issued several months after the radio hit the market. Photofacts issued in January 1947 would be consistent with a radio manufactured in mid-1946, more or less. You can also often date your radio by internal component manufacturer codes. Look for any 6-digit numbers you can find on such items as output transformer, speaker, IF cans, etc. First 3 of these digits will be the manufacturer or "RMA" code, last 3 digits will be the date code. For example, "625" would be the 25th week of 1946.
Poston
:Hi Mark,
:Emerson 535 is listed in Sams set #8 and the 539 is in set #9. Both are dated January '47.
:BR,
:Dave