What movement is in the Orient Mako 40?

An Orient in-house automatic with hand-winding, hacking and a 40-hour reserve. Orient’s UK page and retailers list it as caliber F6722; our catalogue entry carries F6922, which is the Kamasu’s caliber.

How big is the Orient Mako 40?

Orient lists 39.9mm across, 46.5mm lug to lug, 12.8mm thick and 20mm lugs. Our catalogue rounds the diameter to 40mm.

Is the Orient Mako 40 good for diving?

Yes. It is rated to 200m with a sapphire crystal and a unidirectional bezel, which covers recreational diving.

What is the difference between the Orient Mako 40 and the Kamasu?

The Mako 40 is a 40mm case with no crown guards and a date-only dial. The Kamasu is 41.8mm with a day-date window. Both have sapphire, 200m and an Orient in-house automatic, but they use different calibers.

Illustrative render — hero view of the Orient Mako 40 Green

Orient · Mako 40 · Ref RA-AC0Q11E

The Kamasu’s spec sheet, in a 40mm case.

Sapphire crystal, 200m rating, an Orient in-house automatic with hand-winding and hacking, and a sunburst green dial, all in a 40mm case with no crown guards. The smaller Orient diver for the smaller wrist.

Check price on Amazon$250–$500 band

Case

40mm, 12.8mm thick

Orient Watch UK product page

Lug to lug

46.5mm, 20mm lugs

Orient Watch UK product page

Crystal

Sapphire

Orient Watch UK product page

Water resistance

200m

Orient Watch UK product page

Movement

Orient in-house automatic

Caliber number differs by source, see FAQ

Power reserve

40 hours

specs.json and Orient Watch UK

Forty millimetres

Orient built the Mako 40 for the wrists its other divers overwhelmed. The case is 40mm across, 46.5mm lug to lug and 12.8mm thick, with 20mm lugs. The Kamasu on this site is 41.8mm and 46.8mm; the numbers are close, but the Mako 40 is the one that sits inside a cuff.

It keeps everything that made the Kamasu the budget benchmark: a flat sapphire crystal, a 200m rating, a unidirectional steel bezel, and a sunburst green dial with luminous markers and a date at 3.

Illustrative render — forty millimetres of the Orient Mako 40 Green

No crown guards

The case has no crown guards. The crown sits exposed at 3 o’clock, which gives the Mako 40 a cleaner, simpler case profile than most divers. It is a small design choice with a large effect on how the watch reads on the wrist.

Inside is an Orient in-house automatic that winds by hand, hacks, and carries a stated 40-hour reserve on 22 jewels at 21,600 vibrations per hour. Orient makes its own calibers rather than buying them in, at every price it sells at.

Illustrative render — no crown guards of the Orient Mako 40 Green

Strap or bracelet

Orient’s own page for reference RA-AC0Q11E describes a green rubber strap, and the Amazon listing this page links to says the same in its title. The product image on this page shows a steel bracelet. We have not found a documented bracelet variant under this reference, so we do not tell you which one arrives.

Check the listing photos and the item details before you order. The case, crystal, rating and movement are the same either way, and every figure here comes from Orient’s published page and specs.json rather than from a unit we have handled.

Illustrative render — strap or bracelet of the Orient Mako 40 Green

Specs

Reference: RA-AC0Q11E
Case size: 40mm
Case material: Stainless Steel
Movement: Automatic Caliber F6722
Caliber type: Orient In-House Automatic (Hacking, Hand-Winding)
Crystal: Sapphire Crystal
Water resistance: 200m (20 ATM)
Power reserve: 40 Hours
Complications: Date, Unidirectional Bezel
Jewels: 22 Jewels
Frequency: 21,600 vph (3 Hz)
Origin: Made in Japan

Specifications as published by Orient. We research from manufacturer documentation and published sources rather than hands-on testing. Researched 2026-09-03.

Verdict

The compact Orient diver: sapphire, 200m and an in-house automatic in a 40mm guard-free case, with a strap question to settle before you buy.

Strengths

Sapphire crystal and a 200m rating at 40mm
Orient in-house automatic, hand-winding and hacking
No crown guards, so a cleaner and slimmer profile
Sunburst green dial with a simple date

Trade-offs

Strap versus bracelet is unresolved on this listing
Still 12.8mm thick, the same as the Kamasu
Caliber number differs between our catalogue and Orient
Date only, no day, if that matters to you

Buy it if

A smaller wrist that wants a real automatic diver with sapphire and does not want to size up to 42mm.

Skip it if

You need the steel bracelet confirmed, or you want the Kamasu’s day-date.

Check price on Amazon$250–$500 band

FAQ

Orient’s page and the linked Amazon listing describe reference RA-AC0Q11E on a green rubber strap. The product image on this page shows a steel bracelet. This is unresolved, so check the listing before buying.

Compare

OrientMako 40 Green vs Kamasu Automatic Diver

SeikoMako 40 Green vs 5 Sports 5KX

InvictaMako 40 Green vs Pro Diver Automatic 23681

Sources

Researched and last updated 2026-09-03. We do not test watches in hand; every figure above is traceable to the manufacturer or the sources listed here.

Orient Mako 40 Green

Reference RA-AC0Q11E · $250–$500

Check price on Amazon

Prices and availability change; the band above is a research figure, so check the current listing.

Affiliate Disclosure

The Horologist is reader-supported. When you buy through links on our site, we may earn a commission at no extra cost to you. This never influences our editorial recommendations — every timepiece is selected on merit alone.