IWC Portofino Automatic
+3 % above RRP
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ℹ️ 1-month trend
Price change over the past 30 days. Shows the short-term market movement — relevant if you want to buy or sell soon.
ℹ️ 4-month trend
The central metric behind the momentum score. It filters out short-term swings and shows the true, medium-term market trend of this reference.
ℹ️ Volatility
Annualised price fluctuation. Below 10 % = very stable, 10–20 % = normal, above 20 % = volatile. With high volatility the price can change quickly — in both directions. Be cautious about buying without checking the current price.
ℹ️ Momentum score
ChronoCheck's own indicator from 0 to 100, calculated from the 4-month trend, volatility and market direction.
- Above 60 — Upward trend. Good time to sell, prices are rising.
- 40 – 60 — Neutral. Stable price level, no pressure to act.
- Below 40 — Downward trend. Wait or enter at a good price.
ℹ️ Investment Grade A/B/C/D
ChronoCheck's own rating for each reference. A 0–100 point scale, made up of four weighted components:
- Momentum (40 pts) — trend strength from the momentum score.
- Liquidity (25 pts) — number of active live listings.
- Stability (20 pts) — inverse volatility — the calmer, the better.
- Source robustness (15 pts) — number of independent market sources.
- A · 75+ Trend is right, liquidity good, data broad.
- B · 55–74 Solid, but one component weaker.
- C · 35–54 Average, volatility or market breadth weigh on it.
- D · below 35 Downward or too little data — a collector's piece.
Not investment advice. Pure data analysis from aggregated market sources.
What if you had bought back then …
What would a purchase at the median market price back then have become — at today's level of $4,995. A pure return calculation, excluding insurance, servicing and transaction costs.
Data from an aggregated median time series (watch_market_daily). CAGR = Compound Annual Growth Rate, normalized to 365 days. Not an investment recommendation.
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Technical data
Lift angle 52° — important for timing-machine diagnosis: with this value a watchmaker can correctly measure rate deviation, amplitude and beat error. ChronoCheck verifies such technical details directly from the manufacturers' factory specifications.
IWC Ref. IW356523 — Variants and collector names
Known as: Portofino Blue Steel 40, Portofino Steel Blue
Movement variants
- 35111 (2020–today) · 28800 bph
Bezel variants
- IW356523-Bezel-SS-Fixed
Dial variants
- Blue Portofino 40 — Roman numerals at 12 + 6 o'clock, rose-gold-plated baton indices, date at 3 o'clock, IWC inscription in arc at 12 o'clock
Crystal variants
- IW356523-Saphir-AR
Bracelet variants
- Alligatorlederband Schwarz 20mm Ref. IW356523-Strap-Black-Alligator-20mm
The IWC Portofino IW356523 — known among collectors as the "Portofino Blue Steel 40" and "Portofino Steel Blue" — has for several years been one of the rare dress watches in a steel case available pre-owned for under $4,572 that has barely lost any value after 5 years. The 40 mm case is classically proportioned by today's standards, and the midnight-blue dial with baton indices looks just as at home in a professional setting as on any other occasion.
## Calibre 35111: The Movement That Speaks for Itself
Beneath the sapphire crystal, Calibre 35111 runs with a 42-hour power reserve. IWC has used this movement across various Portofino variants since 2006 — servicing is straightforward, spare parts are readily available, and costs at an authorised dealer typically run between $400 and $629. If no-fuss reliability is what you're after, this delivers exactly that.
## What the 2026 Pre-Owned Market Shows
Current listings for the IW356523 on Chrono24 and among specialist dealers range from $3,200 to $3,886 — depending on box, papers, and strap condition. The original crocodile strap shows visible wear after 3 to 4 years of use; models from 2019 onwards came with improved stitching. The original retail price stood at around $4,801 and settling at 67% of that figure today is entirely in line with expectations for an IWC steel model of this class.
Brand profile: IWC
IWC Schaffhausen produces high-quality pilot and sports watches. The Portugieser, Pilot's Watch (Big Pilot + Mark XVIII/XX), and Portofino are the most frequently faked references. Since 2025, APS Factory V3 has produced integrated 52010 super-clones with correct case thickness — classic tells (case thickness, movement visibility) are only partially reliable against these. Key checks today: engraving depth, seconds tick interval, thermally blued hand color, and sub-dial proportions.
- Serial number: genuine IWC serials are 6 digits, purely numeric, on the caseback — all serial numbers are verifiable in the IWC 'My IWC' portal. Fakes often have 7 digits or a mix of letters and numbers.
- Portugieser sub-dial seconds intervals: a GENUINE piece has exactly 3 mini-ticks between each seconds index (high beat rate of 28,800 vph) — fakes have 4 or irregular ticks (lower beat rate).
- Caseback engraving 'International Watch Company': genuine engraving is DEEP (perceptible with a fingernail) and sharp-edged — fakes are shallower, sometimes just laser-printed rather than truly engraved. Test: raking light and a loupe.
- Portugieser/Portofino blue hand color: thermally blued steel shifts from deep blue to light violet depending on viewing angle — painted fake hands show a flat, uniform blue.
Serial number format: IWC serial numbers: 6-digit numeric on the caseback. Verifiable online via the IWC My IWC Portal.
Further sources
Buying guide: IWC Portofino Automatic
Entry into IWC
At $4,995 this reference is one of the more affordable ways to wear a IWC on your wrist. That is precisely why many pieces have already passed through several hands — condition varies accordingly. Buyers here should pay particular attention to service history and honest photos from the seller.
Where the price stands
The price of the Portofino Automatic has risen by +7.1% over the past four months. Anyone selling now hits a good window. If you want to buy: no need to wait — the market is currently more hot than cold, and a clear end to the trend is not in sight.
Watch out for swings: This reference has an above-average volatility of 63.6 percent. In concrete terms: the price can move by several hundred euros within a few weeks. Check the current value before buying or selling — old listings or auction results from two months ago are of little help.
What to look out for when buying?
- Authenticity: The serial number and reference on the case must match the papers. A professional authenticity check of the IWC Portofino Automatic reliably rules out counterfeits.
- Condition: Check scratches on the case and bezel — professional refurbishment can leave traces.
- Service history: A documented service by the manufacturer or a certified watchmaker increases the value.
- Scope of delivery: Box, papers and warranty card make a noticeable price difference on the Portofino Automatic.
- Independent certification: The CPS-52 standard covers 52 checkpoints — from the serial number and the timing machine to water resistance. The result is secured on the blockchain and can be verified at any time.
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