Tissot PRX vs Tudor Black Bay on a 6.5 in wrist
The Tissot PRX 35 is an integrated bracelet watch, in Powermatic 80 and quartz. The Tudor Black Bay 54 is a 37 mm diver. On the PRX 35 product page, the Length figure is case length, not lug-to-lug.
Hodinkee lists 46 mm lug-to-lug for the Black Bay 54 (third-party). Tudor’s product page does not list lug-to-lug. Tissot Singapore lists S$535 for the quartz and S$1,000 for the Powermatic 80. The Hour Glass lists S$6,180 and S$5,860 for the Black Bay 54.
Measure first if you need it: sizing, lug-to-lug, then the fit checker. No cloth tape? Print the 1:1 paper tape.
Official photographs credited above. The PRX photograph is the quartz T137.210.11.351.00. Not a try-on.
Spec snapshot
The main pair is the PRX 35 and the Black Bay 54. The Black Bay 58 (2026) is the longer Tudor case. The PRX 40 is a different case. A 41 mm Black Bay is omitted. The 41 mm Black Bay product pages do not list lug-to-lug.
| Spec | PRX 35 PM80 | PRX 35 quartz | Black Bay 54 | Black Bay 58 (2026) |
|---|---|---|---|---|
| Example refs | T137.207.11.051.00 family | T137.210.11.041.00 family | M79000N-0001 / -0002; Blue M79000B-… | 7939A1A0NU (-0001 5-link / -0002 3-link / -0003 rubber) |
| Diameter | 35.00 mm | 35.00 mm | 37 mm — not 39 | 39 mm |
| Thickness | 10.93 mm | 9.60 mm | 11.2 mm | 11.7 mm |
| Lug-to-lug | Not published. The PRX 35 Powermatic product page lists Length 35.00 mm as case length, not lug-to-lug. | Official Length 34.60 (not lug-to-lug). | 46 mm (third-party, Hodinkee) | 47.8 mm (official press) |
| Press / effective (flag) | Hodinkee: the fixed first bracelet link makes it wear closer to 44 mm (third-party). Integrated effective wear is longer than case length. | Hodinkee’s note on the fixed first link is for the Powermatic 35 mm (third-party). The quartz product page also does not list lug-to-lug. | — | — |
| Water resistance | 100 m | 100 m | 200 m | 200 m |
| Movement | Powermatic 80, Nivachron | Swiss quartz | MT5400 COSC | MT5400-U COSC and METAS (Master Chronometer), 65 h |
| Bracelet / strap | Integrated steel QR + butterfly | Same | 3-link steel or rubber; Tudor T-fit clasp: tool-free adjustment up to 8 mm (per Tudor) | 5-link / 3-link / rubber; Tudor T-fit clasp: tool-free adjustment up to 8 mm (per Tudor) |
| Price (S$) | S$1,000 (Tissot Singapore). | S$535 (Tissot en-sg). Dial/PVD variants differ. | S$6,180 bracelet / S$5,860 rubber (The Hour Glass). | S$6,990 / S$6,830 / S$6,510 (5-link / 3-link / rubber, The Hour Glass). |
The Singapore-dollar figures in the table are Tissot Singapore and The Hour Glass list prices.
Fit on a 6.5 in wrist
A 6.5 in wrist has a usable span of about 48.3 mm. The PRX rows stay Incomplete because the PRX 35 product pages do not list lug-to-lug. The Black Bay 54 is Moderate risk on Hodinkee’s 46 mm (third-party). The Black Bay 58 is Moderate risk on Tudor’s 47.8 mm. 6.5 in size guide · watch index.
| Model | Geometry summary | Why |
|---|---|---|
| PRX 35 | 35 mm wide. Lug-to-lug unpublished. | Fit: Incomplete (lug-to-lug unpublished). Hodinkee says the fixed first link makes the 35 mm Powermatic wear closer to 44 mm (third-party). That length is not a published lug-to-lug. |
| PRX 40 | 40 mm wide. Lug-to-lug unpublished. | Fit: Incomplete (lug-to-lug unpublished). Monochrome lists effective wear near 51 mm for the 40 mm (third-party). That length is not a published lug-to-lug. |
| Black Bay 54 | 37 mm wide · 46 mm lug-to-lug (third-party) | Fit: Moderate risk on a 6.5 in wrist. Hodinkee lists 46 mm lug-to-lug (third-party). Tudor lists 11.2 mm thick. Black Bay 54 notes. |
| Black Bay 58 (2026) | 39 mm diver with official 47.8 mm span | Fit: Moderate risk on a 6.5 in wrist. Tudor’s 2026 press kit lists 47.8 mm lug-to-lug, 1.8 mm longer than Hodinkee’s 46 mm for the 54. |
| 41 mm Black Bay | 41 mm wide. Lug-to-lug unpublished. | Fit: Incomplete (lug-to-lug unpublished). The 41 mm Black Bay product pages do not list lug-to-lug. |
Bracelet and strap
- PRX 35: integrated bracelet. Hodinkee and Monochrome describe a fixed first link, so an effective length is longer than the case length on the PRX 35 product page (third-party). The PRX 35 product page does not list lug-to-lug.
- Black Bay 54 and 58: Tudor lists steel and rubber. The T-fit clasp adjusts up to 8 mm without a tool (Tudor). The strap does not change lug-to-lug.
Singapore-dollar prices
These are list prices named to a seller, not a converted foreign price. By budget · Buying in Singapore.
- PRX 35 quartz: Tissot Singapore lists S$535.
- PRX 35 Powermatic 80: Tissot Singapore lists S$1,000.
- Black Bay 54: The Hour Glass lists S$6,180 on steel and S$5,860 on rubber.
- Black Bay 58 (2026): The Hour Glass lists S$6,990 / S$6,830 / S$6,510 for 5-link / 3-link / rubber.
Authorised dealers
Tissot and Tudor dealers are in the authorised dealers guide. Try it on, or compare a watch you own with the Fit checker.
The two cases
- PRX 35: 35 mm wide, 100 m water resistance, integrated bracelet. Fit: Incomplete (lug-to-lug unpublished).
- Black Bay 54: 37 mm wide, 46 mm lug-to-lug (third-party, Hodinkee), 200 m. Fit: Moderate risk on a 6.5 in wrist. Black Bay 54 notes.
- Black Bay 58: 39 mm wide, 47.8 mm lug-to-lug in the 2026 press kit, METAS-certified movement (Master Chronometer). Fit: Moderate risk on a 6.5 in wrist. Black Bay 54 vs 58.
- PRX 40: Monochrome lists effective wear near 51 mm (third-party). The PRX 40 product page does not list lug-to-lug. Fit: Incomplete (lug-to-lug unpublished).
Styles: by style. A second watch after a Black Bay 54: second watch after the Black Bay 54.
Bottom line
The PRX 35 stays Incomplete because the PRX 35 product page does not list lug-to-lug. The Black Bay 54 is Moderate risk on a 6.5 in wrist, using Hodinkee’s 46 mm (third-party). Side-by-side Tudor sizes: Black Bay 54 vs 58.
Third-party notes
“On the wrist, the PRX Powermatic 80 in 35mm wears closer to 44mm because of the fixed first link on the bracelet.”
Monochrome’s 35 mm vs 40 mm PRX piece lists effective wear near 44.9 mm for the smaller watch and near 51 mm for the 40 mm (third-party).
Sources: Hodinkee — PRX 35 mm · Monochrome — PRX 35 vs 40 (third-party effective lengths). Black Bay 54 46 mm: Hodinkee Black Bay 54 (third-party).
On WristFit SG
Compare the PRX 35 and the Black Bay 54 at 165.1 mm. The index scores a published lug-to-lug only, so the PRX row stays Incomplete. Black Bay 54 notes.
Sources
- Tissot Singapore product pages — PRX 35 quartz S$535 and Powermatic 80 S$1,000. Length, width, and thickness are listed. Length is not lug-to-lug.
- Tudor Black Bay 54 (M79000N) — 37 mm wide, 11.2 mm thick, 20 mm lug width. The page does not list lug-to-lug. Hodinkee lists 46 mm (third-party). Black Bay 58 lug-to-lug 47.8 mm is in Tudor’s 2026 press kit. The Black Bay 58 product page does not list lug-to-lug.
- The Hour Glass product pages for M79000N and M7939A1A0NU — the Singapore-dollar prices above.
- Dealers, as named in the authorised dealers guide.
Unpublished lug-to-lug and photo credits: About & method.