Pro Trek PRT-40

For collectors, the PRT-40 is an important early PRO TREK: a 1996-generation digital tool watch that helped establish Casio’s triple-sensor outdoor-watch identity before the later, more familiar PRG-era designs. Its module 1471, direct sensor-oriented layout, and early Auto-EL illumination make documented original examples—especially complete variants with period-correct straps and an unaltered solid caseback—more desirable than generic later PRO TREK models.