Up for auction is a great example of classic Japanese optical engineering: the Sigma Mini-Zoom 39-80mm f/3.5. Manufactured in Japan during the late 1970s to early 1980s (Serial No. 170481), this lens was highly regarded in its day for packing a versatile wide-to-portrait focal range into an incredibly compact, portable body. Cosmetics & Mechanics: In great vintage shape. The high-quality textured rubber grip is perfectly intact, the zoom and focus rings turn smoothly, and the aperture ring clicks cleanly through all stops.