IWC Portofino Chronograph
5 % below 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.
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Technical data
IWC Ref. IW391036 — Variants and collector names
Known as: Blue Portofino Chrono, Portofino Chrono Blue Steel
Production phases and changes
- 2019: Introduction of the IW391036 as the first unlimited steel variant of the Portofino Chronograph with a blue dial
Movement variants
- 75320 (2019–today) · 28800 bph
Bezel variants
- IW391036-Bezel-SS-Fixed
Dial variants
- IW391036-Dial-Blue-Roman-Gold — IWC SCHAFFHAUSEN / PORTOFINO CHRONOGRAPH / Automatic — 3 totalizers (60s@9h, 30min@6h, 12h@12h) — date+day@3h
Crystal variants
- IW391036-Saphir-Konvex-AR-Doppel
Bracelet variants
- Alligatorleder Schwarz handgemalt Ref. IW391036-Strap-Black-Alligator-20mm
The IW391036 has a backstory you need to know to make sense of where it sits in the market. Before 2019, the Portofino Chronograph in stainless steel existed only as limited editions or special configurations — if you wanted one, you either had the patience to wait or you paid the limited-edition premium. With the IW391036, IWC added the first unlimited steel version with a blue dial to its regular catalog in 2019, alongside the IW391031 in silver. The Sellita-based caliber 75320 was already well established in the line by that point, having succeeded the ETA-based Cal. 79320.
## Blue Dial, Sellita Movement — What That Means for Pricing
The blue dial with gold Roman indices is the visual signature of this reference. Collectors call it the "Blue Portofino Chrono" or "Portofino Chrono Blue Steel," depending on who you ask. The case measures 42 millimeters across, and the fixed stainless steel bezel gives the piece its clean, classical profile. Sellita-based doesn't mean inferior — but anyone running the numbers should know that the IWC brand premium over the movement's intrinsic value is more pronounced here than it would be on an in-house caliber.
## What an Unlimited Reference Does on the Secondary Market
Since its introduction in 2019, the IW391036 has settled into the role of the most accessible entry point in the Portofino Chrono lineup. Unlimited production means no artificial scarcity and no speculation premium baked into the price. On the secondary market, examples trade between $4,001 and $6,287 depending on condition and paperwork. For buyers who want IWC's value stability in a classically sporting package and care about a blue dial, this is one of the rare options that delivers exactly that — no limited-edition surcharge required.
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 Chronograph
Entry into IWC
At $6,721 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.
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 Chronograph 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 Chronograph.
- 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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