First CASIO calculator with IC's. The 152 was produced in two distinct color schemes during its production run from the late 1960s into the early 1970s. Manufacturers at the time frequently varied casing styles to test aesthetics for modern offices or to differentiate export models. During this transition era (1968–1972), CASIO actively experimented with design languages. These color differences were typically driven by target market preferences (such as variations between the domestic Japanese market and North American exports). In some instances, a cosmetic change coincided with a minor internal hardware revision, marking a shift to updated circuit boards or newer generations of NEC MOS-IC chips.