Tissot · PRX and PRX

Tissot T1372071109100 vs Tissot T1374101104100

10 published specifications differ between these two, and 3 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.

What differs

Specification	Tissot PRX 35mm Powermatic 80, green dialT1372071109100	Tissot PRX 40mm quartz, blue dialT1374101104100
Case	316L stainless steel, 35.00 mm wide by 35.00 mm long	316L stainless steel, 40.00 mm wide by 39.50 mm long
Diameter	35 mm	40 mm
Thickness	10.93 mm	10.4 mm
Lug to lug	35 mm	39.5 mm
Lug width	11 mm	12 mm
Crystal	Sapphire with one antireflective coating on bottom side	Sapphire
Dial	Green, with index markers and Super-LumiNova on the hands	Blue, with index markers and Super-LumiNova on the hands
Bracelet	Stainless steel, reference T605047605, interchangeable quick release	Stainless steel, reference T605046447, interchangeable quick release
Movement	Swiss automatic	Quartz three hands
Movement notes	Patented Nivachron balance spring. Date. Total weight 104.00 g. Country of manufacture given as Switzerland, with a stated two-year warranty. Tissot does not name a calibre on this page.	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
Clasp: Butterfly clasp with push-buttons

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.

Case back	See-through caseback	not stated
Power reserve	80 hours	not stated

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 35 mm on the T1372071109100 — a 4.5 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 35 mm on the T1372071109100. 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.

Two different ownership conversations

The T1372071109100 is self-winding and the T1374101104100 is quartz. That changes what a buyer needs telling at handover, and it changes intake: a hand-wound watch has no rotor to mask a tired mainspring, and a stopped quartz watch is usually a battery rather than a fault.

What to check on each

T1372071109100

Check the bracelet reference is T605047605 and not the T605046447 fitted to the 40 mm. The two sizes take different bracelets and a mismatched one will not meet the case cleanly.
Measure the case before you describe it. Tissot publishes 35.00 mm in both directions here, where the 40 mm reference is 40.00 wide by 39.50 long, so this one is genuinely square.
Weigh it against the published 104 g. That is thirty-four grams lighter than the 40 mm, which is most of what a buyer choosing between the two will actually feel.

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.