Seiko SQ Datejust 5Y23-8A60 Roman DIal Quartz 1990 Watch 1995 Twin-Quartz means the caliber has

Twin-Quartz means the caliber has a dual-quartz crystals at 32 KHz + 40 KHz - this is making the ±20 seconds/year accuracy possible

featuring the Seiko Cal

this Vintage Seiko Chronos Watch is a perfect example of that

Nice detail is the mirrored chapter ring that enhances the sunburst-white dial perfectly

Watch is in used condition

Seiko SQ Datejust 5Y23-8A60 Roman DIal Quartz 1990 Watch 1995 Twin-Quartz means the caliber hasBeautiful Seiko SQ watch reference 5Y23 8A60 intended for the export market in a bi color version, very similar to a datejust case with gold colored fluted bezel and white dial with Roman hour markers. Watch was produced in the Daini factory, as can be seen by the Daini lighting bolt on the case back and at 6 o'clock on the dial. SQ stands for Seiko Quartz and was intended for the export market outside Japan, where in the 1990s this was a popular