Seiko - Chronograph 100M Sports - 4T53-00A0 tank Just prior to the quartz

Just prior to the quartz revolution

high-pitched hum or buzz from the tuning fork vibrating at 300 times per second ($300 \text{ Hz}$)

ensuring their professional 200m water resistance rating

defined by its classic rectangular "Tank" style case and a beautiful gold-plated finish

Seiko - Chronograph 100M Sports - 4T53-00A0 tank Just prior to the quartzThis high performance instrument is a rugged, modern artifact from April 2015, as definitively verified by the serial number 549416 stamped on the solid stainless steel caseback. Purpose built by Seiko to deliver professional grade timing under demanding field conditions, it represents the brand's contemporary mastery of heavy duty sports engineering. It houses the ultra precise Caliber 4T53 quartz chronograph movement, an incredibly snappy technical