Are these all Philcos? No. I just like the alliteration. This dial lists KOA, KGIR and all the other buttons are knocked out. That's not a lot to work with. 850 KOA-AM signed on in 1924. They signed on as a 5,000 watt station and in 1927 increased to 12,500 watts, becoming an NBC affiliate in 1929. The station was so ubiquitous in that era it does not narrow the date range.
Today the KGIR-AM calls reside in Cape Girardeau, MO. But back in the 1930s, KGIR was a 500 watt station in Butte, MT on 1360. With only 500 watts of power, I think that puts our radio somewhere between Butte and Cody, WY. They're about 500 miles from Denver, but surely able to receive a clear channel station in that era. The station signed on in 1929 and changed its call letters to KXLF in 1946 which book ends our date range.
Here we have a more to work with, though the labels have slid around unhelpfully: KMP?, KOH, KGMB, KGKBN, KROV, and KICA. But what a weird selection. 590 KGMB I can hardly believe as it's was based in Honolulu. It also can't be KGME-AM in Phoenix, AZ. It signed on in 1940 on 1200, as KPHO only picking up the KGME call letters in 2000. I hope I'm misreading that one. KROV does not exist that I'm aware of. I think that could be KRGV in Oroville, CA but more likely 690 KROW in Oakland, CA which used those calls from 1936 until 1964 before it changed to KABL. More here.
630 KOH-AM was not in LA, it was in Reno, NV from 1928-1994 when it became KRCV-AM. The stick on 780 in Reno is KKOH, it borrows the brand name but is not otherwise related. The original KOH, now KPLY is known the oldest radio station in Nevada.
The first calls are KMP-something. Station 710 KMPC-AM was in Los Angeles. More here. The calls have moved around and currently broadcast Radio Korea on 1540. The station first signed on as KRLO in 1927 and changed calls to KMPC in 1930 and hold the calls for 67 years. Gene Autry owned KMPC in the 1950s. It aged with it's audience and aired Adult Standards and talk radio in the 1980s. But that cannot be it because...
710 KIRO-AM which signed on in 1948. This is of course a problem because you can't listen to KIRO and KMPC both on 710. It's possible that this was before 1937, when KIRO was on 650 but I understood it to be KPCB at that time.
So that has to be KMPG, KMPQ or KMPO. There is no KMPO, not on the AM band in that era anyway. There's a 1520 today in Hollister which is improbable as it only picked up those calls in the 1980s. There was a KMPQ-AM from 1990–1997 in Richmond, TX but it's unrelated. I'm back to an inexplicable KMPC if it's AM... This feels like prank.
Just one more. This one is fun with the vertical station levers instead of push buttons. I see KGFW, KFAB, KMMJ, WGN, and WOW. KGFW, is another heritage station, founded in 1927in Ravenna, NE. The station moved to Kearney in 1931 where is remains today on 1340. KFAB is even older and first signed on as KFRR in 1924. It moved to 770 in 1928.
KMMJ is almost as old, having been founded in 1925 in Clay Center, NE. Noe how near Kearney that is. I think 720 WGN-AM out of Chicago is an outlier, received only because it's a clear channel station. Likewise 590 WOW has been on air for 100 years but never more than 5,000 watts. I think this radio sat between Omaha and Grand Island. This set of stations is pretty consistent. I think my outliers here are from the Police band or SW.
















