[LCC0256]

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.