Seiko Unisex Rotocall

• Model: SMGG21P1
• Brand: Seiko
• Collection: Rotocall / Conceptual Digital Alarm Chronograph
• Gender: Unisex / men’s (worn by men and mixed‑gender audiences)
• Heritage Note: Re‑issue of a 1980s Seiko “Rotocall” digital model, famously used in space missions

• Case Material: Stainless steel, silver tone, with a bold rotating bezel (often blue or blue grey)
• Case Shape: Round, digital calculator style profile with a prominent bezel ring
• Case Finish: Brushed and polished stainless steel surfaces with a high contrast bezel
• Case Colour: Silver case with a coloured bezel (blue or blue grey variant)
• Case Diameter: 37.0 mm
• Case Thickness: 10.5–10.6 mm
• Case Length (lug to lug): Approx. 43.4–43.5 mm
• Crystal: Hardlex mineral glass (or sapphire on some retailers)
• Case Back: Screw or press fit stainless steel caseback
• Dial Display: Monochrome LCD with segmented digital calculator style
• Display Colour: Blue grey or bluish grey digits on a dark grey / black background
• Indices: Segment style digital numerals (no traditional indices)
• Hands: No analog hands; all time and data shown digitally
• Luminescent Elements: No traditional lume; backlight illuminates the LCD in low light
• Strap/Bracelet Material: Stainless steel multi link bracelet
• Strap/Bracelet Colour: Silver
• Strap/Bracelet Width at Case: 20 mm
• Strap/Bracelet Width at Buckle: 16 mm
• Buckle Type: Three fold safety deployment / double fold push button clasp (silver tone)

• Movement Type: Digital quartz (Seiko Caliber A824 / A825 equivalent)  
• Power Source: 3V battery (e.g., CR2016 type)  
• Battery Life: Approx. 36 months  
• Precision: Approx. ±15–20 seconds per month  
• Display Type: Digital LCD (hours, minutes, seconds, date, day, 24‑hour, etc.)  
• Functions:
  • Digital time (12‑ or 24‑hour format)
  • Digital date calendar (day‑of‑month, weekday, sometimes month/year)
  • Stopwatch / chronograph with 1/100‑second resolution up to 1 hour
  • Split and lap timing
  • Countdown / timer functions
  • Dual‑time / second time zone (GMT‑style display)
  • 1‑press or 2‑press alarm (daily alarm)
  • 1/10‑ or 1/100‑second countdown timer
  • All functions controlled via the rotating bezel and pushers

• Case Diameter: 37.0 mm
• Case Thickness: 10.5–10.6 mm
• Lug to lug Distance: 43.4–43.5 mm
• Strap/Bracelet Width at Case: 20 mm
• Strap/Bracelet Width at Buckle: 16 mm
• Wrist Range: Approx. 150–210 mm (adjustable deployment)
• Weight: Approx. 105–110 g (light digital steel construction)
• Color Configuration:
• Case Colour: Silver stainless steel
• Bezel Colour: Blue or blue grey
• Display Colour: Blue grey or bluish grey digits on dark background
• Strap/Bracelet Colour: Silver

• Water Resistance: 10 bar (100 m), suitable for swimming and daily use
• Case & Crystal: Stainless steel case with Hardlex (or sapphire on some retailers); LCD display
• Movement: Digital quartz (Cal. A824 / A825) with full Rotocall style functionality
• Warranty: Typically 2–3 years (varies by retailer, some cite 3 years)
• Packaging: Seiko box, warranty card, and paperwork; some retailers mention space heritage branding materials