RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01
RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01

RM McLaren Speedtail Silver Open Dial Auto & Aviation Watch | RM 40-01

$1,429.00
Free US shipping over $99
S925 silver · 18k gold plated
Color Grey
Size 44 mm

Size Guide

Three ways to get the fit right the first time. If you're ever between sizes, size up — and if a size doesn't work out, our easy 30-day return policy has you covered.

Ring sizes (US)

The most reliable method: take a ring that already fits the intended finger and measure its inner diameter in millimeters with a ruler, then match it below. Fingers swell slightly in heat and in the evening — measure at the end of the day for the truest fit.

US size Inner diameter (mm) Inner circumference (mm)
5 15.7 49.3
6 16.5 51.9
7 17.3 54.4
8 18.1 57.0
9 19.0 59.5
10 19.8 62.1
11 20.6 64.6
12 21.4 67.2

No ring to measure? Wrap a thin strip of paper snugly around the base of the finger, mark where it overlaps, measure the length in millimeters, and match it to the circumference column. Wide bands wear snugger than thin ones — for wide styles, consider going up a half size if available.

Necklace lengths

Lengths are measured end to end, clasp included. For layering, keep at least 2" between chains.

Length Where it sits Wear notes
14" Choker — snug at the neck High necklines, layering base
16" At the collarbone The classic pendant length; sits above most necklines
18" Just below the collarbone Most versatile everyday length; suits nearly all necklines
20" Below the collarbone, above the bust Pairs over crew necks and knits; strong mid-layer
22" At the bust line Statement motifs and longer pendants
24" Below the bust Opera length; wear alone or as the longest layer

Bracelet sizing

Measure your wrist just below the wrist bone with a soft tape (or a strip of paper measured against a ruler), keeping it snug but not tight. Then add ease depending on the fit you want:

Style How to size
Chain bracelets Wrist measurement + 0.5"–0.75" for a standard drape; + 1" for a looser fit
Bangles & cuffs Measure around the widest part of the hand with fingers together — the bangle must pass over it. Cuffs flex slightly; fit to the wrist itself
Watches Wrist measurement + 0.5"; most OAKNOVA watch bracelets include removable links for fine adjustment

Typical reference: women's wrists average 6"–6.5" (bracelet 6.5"–7.5"), men's 7"–7.5" (bracelet 7.5"–8.5").

Still unsure? Contact us with your measurements and the piece you're considering — we'll recommend a size.
18k Gold Plated
Free US shipping $99+
30-day returns
Tracked delivery
18k Gold Plated
Free US shipping $99+
30-day returns
Tracked delivery
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RM McLaren Speedtail Silver Open Dial  Auto & Aviation Watch | RM 40-01 features a sculptural tonneau-shaped case with an intricate skeleton-style dial that reveals layered mechanical-inspired details. Bold Arabic hour markers, contrasting hands, red and green accents, and subtle orange highlights create a dynamic motorsport-inspired appearance, while exposed case screws enhance its technical character.

Finished with a brushed silver-tone case and a black rubber-style strap accented with an orange center detail, the watch combines a substantial silhouette with comfortable contemporary styling. Its distinctive open-dial design makes it a bold statement piece for casual outfits, travel, evening events, special occasions, or collectors of unconventional watches.

Orders are processed in 2–4 business days; US orders typically arrive within 9–16 business days in total. US & Canada: flat $6.99 shipping, free on orders over $99. UK & Europe: $7.99, free over $130. Australia: $10.99, free over $160. Every order includes tracking — follow yours at Track your order. Returns can be requested within 30 days of delivery on unworn items in original packaging (earrings must have hygiene seals intact); final-sale items are excluded.

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