Tissot · PR 100 Sport Chic and PRX

Tissot T1019101135100 vs Tissot T1374101104100

9 published specifications differ between these two, and 4 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.

What differs

Specification	Tissot PR 100 Sport Chic 36mm, quartz, blue dialT1019101135100	Tissot PRX 40mm quartz, blue dialT1374101104100
Case	316L stainless steel, 36.00 mm	316L stainless steel, 40.00 mm wide by 39.50 mm long
Diameter	36 mm	40 mm
Thickness	9 mm	10.4 mm
Lug to lug	36 mm	39.5 mm
Lug width	18 mm	12 mm
Crystal	Sapphire with one antireflective coating on bottom side	Sapphire
Bracelet	Stainless steel, reference T605042083	Stainless steel, reference T605046447, interchangeable quick release
Clasp	Folding clasp with push-buttons	Butterfly clasp with push-buttons
Movement notes	Battery voltage 1.55 volts. Date. Total weight 112.00 g. Country of manufacture given as Switzerland, with a stated two-year warranty. No end-of-life indicator is listed for this reference.	Battery voltage 1.55 volts. EOL battery end-of-life indicator. Date. Total weight 130.00 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.

Water resistance: Water-resistant up to a pressure of 10 bar (100 m / 330 ft)
Bezel: Stainless steel
Dial: Blue, with index markers and Super-LumiNova on the hands
Movement: Quartz three hands

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.

One of these is the harder fit

Lug to lug is 39.5 mm on the T1374101104100 against 36 mm on the T1019101135100 — a 3.5 mm difference across the wrist. Diameter is what buyers ask about; lug to lug is what decides whether a case sits flat or overhangs. Ask for a wrist measurement before shipping the T1374101104100, and put the figure in the listing rather than the diameter alone.

These reach different buyers

40 mm on the T1374101104100 against 36 mm on the T1019101135100. Diameter is a poor predictor of how a watch actually sits, but it is the field buyers filter on, so the two land in front of different people. Do not let one listing's photographs or copy stand in for the other.

What to check on each

T1019101135100

Note that no end-of-life indicator is listed here, unlike the chronograph references in this range. A stopped or erratic watch cannot be read as a battery warning, so measure the cell rather than inferring.
Check the folding clasp for play at its hinges. It is the only closure on the watch, the case is thin and light, and worn hinge pins show as a clasp that rocks.
Look at the case flanks and lug edges under raking light. A nine-millimetre polished case has almost no satin surface to hide marks in.

T1374101104100

Separate this from the automatic before you write a word. Tissot publishes 10.40 mm and 130 g here against 10.93 mm and 138 g for the automatic, and the automatic has a see-through caseback while this page lists none.
Watch the seconds hand. A quartz three-hand movement steps once a second and an automatic sweeps, which settles the question in two seconds with no tools.
Check whether the end-of-life indicator has triggered. Tissot lists an EOL function, so a seconds hand jumping in multi-second steps is the watch reporting a flat battery rather than a fault.

Sources

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.