i have 2 KLH model 21 radios (serial # 039604 & 09558) that i dont know the production years. Can someone tell me how to find out. I have a Zenith G515 small clock radio gray in color produced sometime in the 1960's that i am having trouble finding information on. Lastly i have 2 Ward Airline radios one was manufactured in 1948 has a wood case table top AM (with dial light) but i cannot find a model # The second Ward Airline is a brown plastic (don't think it is bakelite) AM push button table size radio that i cannot find a model number or production year. Could someone please help me with any of these or send me in the right direction? Thank you.

Pictures would help a lot or go to ebay and search radio with the manufacturers name and you might find your radio.

Look for date codes on the speaker, transformers, capacitors - usually 6-7 digit number... sometimes only 3 digits (YWW - 1 digit year, 2 digit week).

Service info for the G515 is in Sams folder 665-13 (1963). Can't help with the others without a model number... try radioattic.com - archives - as well.

Thank you gentlemen so much. I will look closely inside the radios for the information. ..what is Sam's folder? sorry for the ignorance...