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1957 Motorola portable tube radio with a secret
This little radio contains a component that was developed during the Korean war, and was secret at the time.
"This is one of only three radios built to display the advantages of the "Tinkertoy" technology developed in a secret project by the National Bureau of Standards (NBS) for the NavyBureau of Aeronautics. These models were reated to show commercial rthe pre-transistor technology. Motorola for one used the technology in some of their portable models."
https://www.radiomuseum.org/r/ambu_tinkertoy_radio.html
"Notes
Color= Navy leatherette. See here about Tinkertoy technique. The Beitman R-18 shows the following models with this chassis HS-559: 5P31A, 5P32C, 5P32E, 5P32R and 5P32Y but also 5P33EW, 5P33VW and 5P33W for chassis HS-561. See also 66L1 and 66L2 with Tinkertoy technique."
https://www.radiomuseum.org/r/motorola_5p32e5_p_32_ch_hs_599hs5.html