Casio Quartz – Ref. 350B612 (Japan M), early 1980s

This Casio quartz watch dates from the early 1980s and exemplifies the simple, functional style of that era, during which Casio consistently refined its digital watches. The watch was completely disassembled in November 2025 , cleaned internally, and fitted with a new battery . It is in good condition , retains its original strap , and runs perfectly.

Technical data

• Reference: 350 B612
• Origin: Japan M
• Year: ca. 1981–1982
• Functions: Hour, minute, second and date display
• Display: Digital LCD
• Movement: Casio Quartz (B612 caliber, with lithium battery)
• Case: chrome-plated metal, stainless steel base
• Dimensions: 34.8 × 33.7 mm
• Lug-to-lug: 38.2 mm
• Height: 7.7 mm
• Lug width: 18 mm
• Weight: 47 g (including original strap)
• Bracelet: original Casio stainless steel bracelet with folding clasp
• Battery replaced: November 2025

Design and background

The Casio 350B612 is a classic example of the second generation of Japanese digital watches. It combines the typical clarity of early Casio design language with a pleasantly slim case profile. The minimalist display with its rectangular frame shows only the essential functions – time and date – and dispenses with any superfluous indicators.

This model series marks the period between the late 1970s, when Casio first used digital displays, and the later multifunction watches of the 1980s, such as the F-81 or A-159. The B612 movement used here is considered robust and precise and was used in numerous early Casio models.

Condition

The watch is in good, used condition . The case shows slight signs of wear consistent with its age, but the watch has not been polished in order to preserve its original finish. The display is clear and easy to read, the buttons function perfectly, and the original strap closes securely.

A very well-preserved, authentic example of Casio's functional digital watches from the early 1980s.

Warranty (used)
This is a used item. The limitation period for claims based on defects (statutory warranty) is 12 months from delivery.

Notice
As this is a pre-owned watch, water resistance cannot be guaranteed. To protect the movement, the watch should not come into contact with water or moisture.