View source for Reference:177200

{{DISPLAYTITLE:Rolex 177200 Oyster Perpetual 31}}
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|title=Rolex Oyster Perpetual 31 (177200) — 2007–2020, Cal 2231 &#124; BezelBase
|description=The 177200 was the Oyster Perpetual 31 from 2007 to 2020 — Cal 2231, white and blue azzurro dials documented. One of only two entry-tier OP sizes Rolex carried forward unbroken into 2020, replaced directly by the 277200 rather than discontinued outright.
|keywords=Rolex, 177200, Oyster Perpetual 31, Oyster Perpetual, specifications, reference guide
|image=Ref 177200 hero.webp
|image_alt=Rolex Oyster Perpetual 31 177200 on Oyster bracelet
|type=Article
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<small>[[Reference:oyster-perpetual|Oyster Perpetual]] -&gt; '''177200'''</small>

The 177200 is the Oyster Perpetual 31: a 31mm steel Oyster on caliber 2231, in production from 2007 to 2020. It is routinely lumped together with the 176200 in casual references to "the 176200/177200" pair — the two share a launch year and a caliber family, but the 176200 is a 26mm watch and the 177200 is a 31mm watch, five millimetres and a full case-diameter step apart. Where Rolex dropped the 26mm size outright in 2020, the 31mm survived the transition, replaced directly by the 277200 rather than discontinued.

<span id="core-facts"></span>

[[File:Ref 177200 hero.webp|thumb|right|250px|alt=Rolex Oyster Perpetual 31 177200 on Oyster bracelet|Rolex Oyster Perpetual 31, ref. 177200]]

== Core facts ==

{| class="wikitable"
|-
! detail
! value
|-
| reference
| 177200
|-
| family
| Oyster Perpetual
|-
| common name
| "Oyster Perpetual 31," "OP31"
|-
| production
| 2007–2020
|-
| case
| 31mm steel Oyster, monobloc middle case, domed bezel
|-
| crystal
| scratch-resistant sapphire
|-
| crown
| Twinlock screw-down
|-
| water resistance
| 100m / 330 feet
|-
| movement
| caliber 2231, self-winding, ~48h reserve, COSC certified
|-
| dial (documented)
| white, blue azzurro
|-
| bracelet
| Oyster, flat three-piece links, Oysterclasp
|-
| predecessor
| earlier 31mm no-date Oyster Perpetual generations
|-
| successor
| 277200, Oyster Perpetual 31 (2020) — direct same-size replacement
|}

<span id="where-it-sits-in-the-line"></span>
== Where it sits in the line ==

The 177200 belongs to the same 2007 refresh as the 176200, 116000 and Air-King 114200, sharing caliber 2231 with the 176200 and the general design language of the whole generation: engraved rehaut, COSC certification, domed bezel, Oyster bracelet. Its own archived Rolex catalogue page lists the "OYSTER PERPETUAL 31" as a distinct model from the "OYSTER PERPETUAL 26" — Rolex's own site copy treated the two as separate watches, not dial variants of one reference.

Unlike the 26mm and 39mm sizes, which Rolex retired outright in the 2020 relaunch, the 31mm size survived — the 177200 handed off directly to the 277200, keeping the same case diameter through the transition to caliber 2232 and the wider Stella-inspired dial range. That makes the 177200 one of only two pre-2020 entry-tier Oyster Perpetual sizes (with the 36mm 116000) to have a like-for-like successor rather than a discontinuation or a size change.

<span id="production-outline"></span>
== Production outline ==

The 177200 entered the catalogue in 2007 alongside the 176200, 116000 and Air-King 114200, running through to 2020 on caliber 2231 with no documented reference-number change across the run. Rolex's archived catalogue shows it current as late as an archived 2019 snapshot, before the September 2020 relaunch replaced it with the 277200.

<span id="movement-notes"></span>
== Movement notes ==

Caliber 2231 is shared with the 176200, the smaller-diameter movement family Rolex used on its 26mm and 31mm Oyster Perpetual sizes rather than the caliber 3130/3132 fitted to the 34mm, 36mm and 39mm references of the same generation. Self-winding via the Perpetual rotor, roughly 48 hours of power reserve, COSC chronometer certification standard across the run.

<span id="dial-map"></span>
== Dial map ==

Two configurations are documented: a white dial and a "blue azzurro" dial, both with applied stick hour markers and baton hands. As with the 176200, the documented range likely undercounts the full palette offered across a 13-year run; only these two are independently confirmed here.

<span id="case-bezel-crystal-and-crown-notes"></span>
== Case, bezel, crystal, and crown ==

31mm monobloc-middle Oyster case in Oystersteel, domed smooth bezel, sapphire crystal without a Cyclops lens, Twinlock screw-down crown, 100m water resistance.

<span id="bracelets-and-clasps"></span>
== Bracelets, end links, and clasps ==

Oyster bracelet, flat three-piece links, folding Oysterclasp — consistent with the rest of the 2007-generation entry-tier line.

== Related references ==

* [[Reference:176200|Oyster Perpetual 26 (176200)]] — same generation, same caliber family, one size down
* [[Reference:116000|Oyster Perpetual 36 (116000)]]
* [[Reference:114200|Air-King 114200]] — same 2007 launch year

See also the [[Reference:oyster-perpetual|Oyster Perpetual family index]], [[Reference:Movements|movement reference]], [[Reference:Bracelets|bracelet & clasp guide]], and [[Reference:Serial-numbers|serial numbers by year]].

== Sources ==

* [https://web.archive.org/web/20181111064658/https://www.rolex.com/watches/oyster-perpetual/m177200-0016.html Rolex Oyster Perpetual 31, ref. 177200 — official specifications, archived] (rolex.com via Wayback Machine, 2019)
* [https://web.archive.org/web/20181111072551/https://www.rolex.com/watches/oyster-perpetual/m177200-0015.html Rolex Oyster Perpetual 31, ref. 177200, blue azzurro dial — official specifications, archived] (rolex.com via Wayback Machine, 2019)
* [https://www.watchguys.com/pages/rolex-oyster-perpetual-guide Robertino Altieri, "Rolex Oyster Perpetual Buyer's Guide: History & Prices", WatchGuys]

[[Category:Oyster Perpetual]]