Seiko Base Metal and Stainless Steel Watch Case (2H20-5630)
Watch Case (Non-Gold) · N/A - This is a silver-toned base metal alloy and stainless steel item, not gold.
Purity: None. This item contains 0% gold. It is constructed from non-precious base metal and stainless steel.
Type
Watch Case (Non-Gold)
Purity
None. This item contains 0% gold. It is constructed from non-precious base metal and stainless steel.
Gold Type
N/A - This is a silver-toned base metal alloy and stainless steel item, not gold.
Weight
15 to 25 grams (total case weight including movement remnants)
Description
A utilitarian Seiko watch case featuring a base metal bezel and a stainless steel snap-back. The 'Base Metal' marking explicitly indicates the lack of precious metal content in the main body.
Key Features
Japanese quartz movement reference 2H20, snap-back construction, and standard lugged design for strap integration.
Color & Finish
Silver-toned chrome or nickel plating over base metal with a brushed/satin stainless steel case back.
Hallmarks & Stamps
Stamped 'SEIKO', 'BASE METAL', 'ST. STEEL BACK', '2H20-5630', 'JAPAN MS', and serial '710042'.
Dimensions Estimate
Approx. 28mm to 32mm width (excluding crown), standard petite to mid-size vintage watch dimensions.
Gemstones & Inlays
None visible; standard watch case construction.
Clasp & Closure
Snap-on stainless steel case back; lugs present for spring bar attachment to a strap.
Chain & Links
N/A; integrated lugs for a leather or metal band (currently missing).
Craftsmanship Details
Mass-produced stamped stainless steel back with a cast base-metal frame; typical of entry-level consumer horology.
Authentication Indicators
Authentic Seiko markings but 'Base Metal' and 'St. Steel Back' are definitive markers that the item is NOT gold.
Origin & Maker
Japan; manufactured by Seiko Watch Corporation, a leading global watchmaker.
Era & Period
Modern/Late 20th Century (likely 1980s or 1990s based on Seiko movement coding).
Age Estimate
Circa 1987 or 1997 based on serial number start and movement production cycles.
Cultural Significance
Represents the mass-market quartz revolution where affordable, durable materials replaced traditional gold in everyday timepieces.
Condition Notes
Fair to Poor. Significant pitting and plating wear on the base metal lugs; evidence of corrosion and scratching throughout.
Value Estimate
Negligible/Scrap value. As it contains no precious metal and is in poor condition, market value is likely under $5 USD.
Care & Maintenance
Keep away from moisture as base metal corrodes easily once the plating is breached. Do not use gold polishing cloths.
Similar Items
Seiko SGP (Gold Plated) models or Seiko Goldfeather (Solid Gold) which would carry '14K' or '18K' stamps rather than 'Base Metal'.
Interesting Facts
The 'Base Metal' stamp was a legal requirement to distinguish chrome-plated brass or zinc alloys from solid precious metals.