Tissot · Chrono XL Classic and Seastar 1000
Tissot T1166171609200 vs Tissot T1204171104103
10 published specifications differ between these two, and 2 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | Tissot Chrono XL Classic 45mm, quartz, leather strapT1166171609200 | |
|---|---|---|
| Case | 316L stainless steel, 45.00 mm | 316L stainless steel, 45.50 mm, with screw-down crown and caseback |
| Diameter | 45 mm | 45.5 mm |
| Thickness | 11.02 mm | 12.82 mm |
| Lug to lug | 45 mm | 45.5 mm |
| Water resistance | Water-resistant up to a pressure of 10 bar (100 m / 330 ft) | Water-resistant up to a pressure of 30 bar (300 m / 1000 ft) with screw-down crown and push-buttons |
| Crystal | Sapphire | Sapphire with double antireflective coating on top and bottom sides |
| Dial | Green, with Arabic indexes and Super-LumiNova on the hands | Blue, with index markers and Super-LumiNova on the hands |
| Bracelet | Leather, reference T600041655; front in alligator-style grained cowhide, back synthetic; strap length 120.00 mm at 6 o'clock and 75.00 mm at 12 o'clock; interchangeable quick release | Stainless steel, reference T605046894, interchangeable quick release |
| Clasp | Standard buckle | Folding clasp with safety lock, diver extension and double push-buttons |
| Movement notes | Battery voltage 1.55 volts. EOL battery end-of-life indicator, 30-minute and 1/10 second counters, central 60-second chronograph hand, ADD and SPLIT functions. Date. Total weight 75.00 g. Country of manufacture given as Switzerland, with a stated two-year warranty. | Battery voltage 1.55 volts. EOL battery end-of-life indicator, 30-minute and 1/10 second counters, central 60-second chronograph hand, ADD and SPLIT functions. Date. Total weight 180.00 g. Country of manufacture given as Switzerland, with a stated two-year warranty. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Lug width
- 22 mm
- Movement
- Quartz chronograph PowerDrive
Stated for one, not the other
These rows cannot be compared, because one maker publishes the figure and the other does not. An empty cell is a gap in the manufacturer's documentation, not a gap in the watch — and not a licence to fill it in from the other column.
| Bezel | not stated | Stainless steel with aluminium bezel ring, anti-clockwise rotating, with Super-LumiNova on the case |
|---|---|---|
| Case back | not stated | Screw-down caseback |
| Crown | not stated | Screw-down |
What the differences cost you
Each note below follows from the published figures in the tables above — what they mean for intake, for a listing, and for the handover. Nothing here estimates a price or a margin.
A visible difference in how they wear
1.8 mm of thickness separates these, with the T1204171104103 the taller at 12.8 mm. That is the difference between a watch that goes under a cuff and one that catches on it — worth a photograph from the side rather than a number in a table.
Do not describe these the same way
300 metres on the T1204171104103 against 100 on the T1166171609200 — not a variation on the same watch but a different class of one, built around a case and crystal designed for depth. Expect different buyers, different questions, and a different service conversation. Never carry the T1204171104103's rating into the T1166171609200's listing.
What to check on each
T1166171609200
- Use the published strap lengths of 120 mm and 75 mm to answer fit questions before shipping. Tissot states both halves, which is more than most makers give, and a 45 mm watch on a fixed-length strap either fits or it does not.
- Read the strap construction carefully: the front is alligator-style grained cowhide and the back is synthetic, so describe it as grained calf rather than as alligator.
- Test the ADD and SPLIT functions, not just start and stop. Both are listed for this movement and neither is exercised by a simple timing run.
T1204171104103
- Unscrew both pushers before testing the chronograph. Tissot states the 30 bar rating with screw-down crown and push-buttons, so the pushers thread down and will not operate until released.
- Grade the bezel ring as aluminium. It dulls, fades and takes dents rather than chipping, and a faded insert on this reference is honest wear rather than damage.
- Exercise the ADD and SPLIT functions separately. Both are listed for this movement and a split that will not catch up to the running time is a fault a simple start-stop test misses.
Sources
- Tissot official product page for reference T1166171609200 (Tissot Chrono XL Classic 45mm) - SKU: T1166171609200; Weight (g): 75.00; Warranty: 2 Years of Warranty; Country of manufacture: Switzerland; Length (mm): 45.00; Width (mm): 45.00; Thickness (mm): 11.02; Lug width (mm): 22.00; Water resistance: Water-resistant up to a pressure of 10 bar (100 m / 330 ft); Case material: 316L stainless steel; Crystal: Sapphire; Movement: Quartz chronograph PowerDrive; Battery voltage (volts); 1.55; Functions: EOL (battery end-of-life indicator), 30-minutes and 1/10 of a second counters, Central 60-seconds chronograph hand, ADD and SPLIT functions; Main Functions: Date; Dial colour: Green; Indexes: Arabic; Luminescent material on the hands: Super-LumiNova; Strap/Bracelet reference: T600041655; Strap length 6h (mm); 120.00; Strap length 12h (mm); 75.00; Strap material: Leather; Strap front; Alligator-style grained cowhide; Strap back; Synthetic; Strap colour: Brown; Buckle: Standard buckle; Bracelet option: Interchangeable quick release bracelet — retrieved 2026-09-22
- Tissot official product page for reference T1204171104103 (Tissot Seastar 1000 45.5mm) - SKU: T1204171104103; Weight (g): 180.00; Warranty: 2 Years of Warranty; Country of manufacture: Switzerland; Length (mm): 45.50; Width (mm): 45.50; Thickness (mm): 12.82; Lug width (mm): 22.00; Water resistance: Water-resistant up to a pressure of 30 bar (300 m / 1000 ft) with screw-down crown and push-buttons; Case material: 316L stainless steel; Case options: aluminum bezel ring, Anti-clockwise rotating bezel, Screw-down crown and caseback; Bezel Material: Stainless steel; Luminescent material on case; Super-LumiNova; Crystal: Sapphire with double antireflective coating on top and bottom sides; Movement: Quartz chronograph PowerDrive; Battery voltage (volts); 1.55; Functions: EOL (battery end-of-life indicator), 30-minutes and 1/10 of a second counters, Central 60-seconds chronograph hand, ADD and SPLIT functions; Main Functions: Date; Dial colour: Blue; Indexes: Index; Luminescent material on the hands: Super-LumiNova; Strap/Bracelet reference: T605046894; Strap material: Stainless steel; Strap colour: Grey; Buckle: Folding clasp with safety lock, diver extension and double push-buttons; Bracelet option: Interchangeable quick release bracelet — retrieved 2026-09-22
Not affiliated with Tissot. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.