Are you referring to the Elcaset? I think it ran at 3.5 ips.
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I have some Teac cassettes with clear shells that contain what look like miniature reel-to-reel gold metal reels. The Teac part # is CRC-90. They are high-bias, 90 minute tapes. But, they are fully enclosed and functional cassettes, just designed to look like a mini R2R setup. Could this be to what you're referring? I can't imagine any cassette deck of that day having enough room inside the cassette well to thread a tape. That would be quite a trick. :-)