Description
PK Sport Elegant Steel – Jump Hour Automatic Watch, Seagull ST1721, Sapphire Crystal, 45mm
The PK Sport Elegant Steel is an oval 34.5x45mm automatic watch powered by the Seagull ST1721 jump hour movement – a complication where the hours do not sweep continuously but snap instantaneously from one digit to the next at each new hour. The jump hour display at 12 o’clock and rotating minute disk at 6 o’clock replace the conventional hand layout entirely, producing a dial that reads as architectural and futuristic. Sapphire crystal, 316L stainless steel case, 5 Bar water resistance, and a rubber strap with hidden butterfly clasp. Available in Red, Green, and Black.
Specifications
Seagull ST1721 Jump Hour automatic. Oval case 34.5x45mm, sapphire crystal, 5 Bar, rubber strap.
Jump Hour Complication
A jump hour display advances the hour indicator in a single instantaneous snap at each new hour rather than rotating continuously. The effect is dramatic – the hour appears, holds motionless for a full 60 minutes, then snaps to the next digit in a fraction of a second. The minute disk rotates continuously and provides the between-hour time reference. Reading the time requires a brief adjustment from conventional hands but becomes second-nature within days of wearing.
Seagull ST1721
The Seagull ST1721 is a jump hour automatic movement made by Tianjin Seagull – one of China’s most established movement manufacturers, producing movements used in watches across the price spectrum including some sold by Swiss brands. The ST1721 is an automatic base movement modified for jump hour function, self-winding via the rotor in normal wear. Sapphire crystal above; 316L steel case around it.
Oval Case with Rubber Strap
The 34.5x45mm oval case – wider in the vertical lug-to-lug axis than the horizontal dial diameter – creates a distinctive case silhouette that lies naturally along the wrist’s vertical axis. On a rubber strap with hidden butterfly clasp the oval case reads as sport-modern rather than dress-formal: the unusual shape is the statement; the rubber strap confirms the active daily wear intent.
Blank Face Minimalism
No brand markings on the dial face – the jump hour display and minute disk are the only elements visible. The blank face approach creates a dial that presents as architectural and considered, where the time display mechanism is the aesthetic point rather than branding or decoration. In Red, Green, or Black.
The Case for the Jump Hour
The jump hour complication exists because some watchmakers – and some watch wearers – find the conventional analogue display less satisfying than a more direct relationship between the mechanical action and the time displayed. On a standard watch the hour hand moves continuously and unthinkingly, and you read the time by estimating where the hand is between its hour markers. On a jump hour watch the hour is displayed as a number in a window, and it advances with a visible, decisive mechanical action at the moment of the hour change. The minute disk rotates continuously, visible between the digit windows, providing the between-hour reference. The result is a time display where you see a mechanical action happen – the snap of the hour – rather than inferring the time from hand position. The Seagull ST1721 is one of the more accessible platforms for experiencing this complication with an automatic movement.
The PK Sport Elegant Steel (Specht and Sohne SP00031) is available in Red, Green, and Black. Backed by Wclocks 1-year warranty.
Wear It For
The jump hour automatic on rubber suits collectors, enthusiasts, and wrists that want something genuinely different.
Complication Collectors
A jump hour automatic at this price is the accessible entry to a complication that is otherwise expensive. For the collector who wants the jump hour experience without the cost of a Swiss complication piece, the ST1721-powered PK Sport Elegant is the practical choice.
Daily Conversation Piece
The jump hour display stops people who know watches and confuses people who do not – in the best way. Explaining the snap-hour mechanism to an interested observer is a different kind of conversation than explaining an automatic or a chronograph. The blank face and oval case add to the distinctiveness.
Smart Casual and Sport
On a rubber strap at 45mm the PK Sport Elegant is proportioned for smart casual and sport contexts. Red is the boldest and most sport-character variant; Black is the most versatile; Green sits between them.
Mechanical Enthusiast Gift
A jump hour automatic on sapphire crystal with a Seagull movement is a gift that will be understood and appreciated by anyone who follows mechanical watchmaking. The complication is distinctive; the mechanism is genuine; the price is accessible. Arrives presentation-boxed.
Explore More at Wclocks
Browse the full automatic and complication watch collection at Wclocks.
Frequently Asked Questions
What is a jump hour display?
What is the Seagull ST1721?
How do I read the time?
What does the butterfly clasp do?
What is the water resistance?
What do the three colour options (Red, Green, Black) refer to?
Is this an automatic or manual movement?
Jump Hour. Seagull Automatic. Sapphire. Oval.
PK Sport Elegant Steel – 34.5x45mm Seagull ST1721 jump hour automatic, sapphire crystal, 316L stainless steel, rubber strap with butterfly clasp, 5 Bar / 50M, 1-year Wclocks warranty. Available in Red, Green, Black.
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