This is a 1983 Seiko Chronograph Moonphase Ref.7A48-7020, a unique quartz watch from Seiko's golden era of innovation. It features a 1/10th second quartz chronograph and moonphase complication, housed in a 37mm stainless steel case with a 30m water resistance rating.

• Condition: Great, serviced
• Case size: 37mm diameter
• Lug to lug length: 41.8-42mm
• Thickness: 10.6-11mm