The Brand "Science Fair" was actually owned by Tandy which of course actually was Radio Shack. They had a microcomputer trainer with a similar design. On the bottom it says in tiny print: made in china. I have no definitive date on when these were made. It appears to be a mid 1980s product just from the color scheme and the condition of the hardware. For what it's worth, Tandy trademarked the brand "Science fair" in 1970. More here.
They worked but were totally inferior to other available gear. You can get a breadboard and jump wires cheap enough to call it a toy. Btu if you want to go all out, the Denshi block-type units like the Gakken EX-System were reissued in 2002, so they are available but very pricey. See below:
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I got one of those exact same AM-FM radio kits as a present. It was definitely before the mid-1980s because I was in college by then. I believe it might date more to the late 1970s. Regardless of the year, it worked horribly. Even in the very flat and relatively open suburbs of Sacramento I recall it only being able to pick up powerhouse AM station KFBK and two (maybe three) FM stations. I had more fun with it hooking up the wires to places they weren't supposed to go which could cause the thing to make some really obnoxious tones. I recall selling it at a garage sale for maybe 75 cents.
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