Maxell UDC-120
Not much is documented about the Maxell UDC-120 itself. No dedicated review, catalog page, or price entry naming that exact model has surfaced in the Archive. The period record does show the line it belonged to. A 1972 listing in HiFI-Stereo (1972, p.122) described Maxell's "Ultra Dynamic" high-energy, double-range cassettes. The C60 was priced at $3.95 (30 min/side) and the C90 at $5.85 (45 min/side). The listing also covered Maxell's chromium-dioxide and low-noise cassettes. The same listing appeared in Audio-Collection (1972, p.124).
Ultra Dynamic naming puts the total playing time in the number after "C", and the per-side timings of the C60 and C90 confirm it. By that convention, the "120" in UDC-120 suggests the 60-minutes-per-side member of the family. That is an inference. The exact tape formulation, packaging, and production dates are undocumented.
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