[Ron Ramirez]

Peter

Product "model years" did not correspond to a calendar year.

Philco began using "model years" in May-June 1934; this new model line was called the 1935 selling season. I do not know when other manufacturers adopted the concept of the model year, but all manufacturers seemed to be doing this by the mid to late 1930s. This practice continued for the next few decades, or until television replaced radio as the primary entertainment medium. Yet even then, manufacturers continued to use the model year.

Proof:
1935 Philco sales catalog - https://philcoradio.com/library/index.ph...june-1934/
1936 Philco sales catalog - https://philcoradio.com/library/index.ph...june-1935/
1937 RCA radio catalog - https://philcoradio.com/phorum/showthread.php?tid=21204
1938 Philco sales catalog - https://philcoradio.com/library/index.ph...june-1937/

There are a few more here:
https://philcoradio.com/library/index.ph.../catalogs/

This did not hold true for the 1946 season because of the end of World War II. Consumer radio production did not resume until January 1946. This five to six month period became the 1946 season. The 1947 season then began May-June 1946.