Orient Mako GMT Australia: Sizing, vs Kamasu, and Which Dial to Pick

If you already like Orient Kamasu or have been circling an Orient Mako 3, the new GMT answers a different question: can a Mako show home time while you are in another zone? For many Australian buyers — Perth to the east coast, a Bali week, a Japan trip — that is more useful than another colourway of the same 41.8 mm diver.

This guide covers how the Orient Mako GMT works, how it sizes against Kamasu and Mako 40, which RA-BC000x dial to pick, and when a Seiko 5 Sports GMT is the better tool. Stock and prices below are what we hold at Chronospride at publish time, not a promise that every colour stays up.

What the Orient Mako GMT actually is

Epson’s autumn 2026 Orient release finally put a GMT into the Mako sports line. The regular four references share one case and movement:

• RA-BC0001B — black dial
• RA-BC0002E — green dial
• RA-BC0003L — navy / blue dial
• RA-BC0004Y — orange dial

There is also a world-limited blue gradient, RA-BC0005L (4,000 pieces globally). We listed it; it is currently out of stock. Do not wait on the limited if you want a GMT on the wrist this month — the four regulars are the buyable Orient Mako GMT set.

Shared hardware, from manufacturer notes and specialist listings that match this generation:

• In-house automatic Orient F6P22, about 40 hours of reserve, rated +25 / −15 seconds per day, hand-winding and hacking seconds
• 20 jewels
• 316L steel case and bracelet, screw-down crown, screw-in case back
• Sapphire crystal
• 200 m / 20 bar water resistance
• Unidirectional 24-hour bezel, 120 clicks, two-tone insert
• Date at 3; lume on indices and hands

Epson is explicit that the Mako, including this GMT, is not an ISO 6425 divers’ watch. Treat 200 m as a sealed sports specification for swimming, boats, and showers — not as a professional saturation-dive claim. That is the same honesty we use in the broader dive watches Australia guide.

How the GMT function works (and what it is not)

This is a “caller” GMT, in the 1950s airline sense Orient describes: a 24-hour hand that is geared to the 12-hour hand. You cannot independently jump the GMT hand the way you can on many true flyer GMTs (including most Seiko 5 Sports GMTs).

In practice:

1. Set local time with the crown as usual. The GMT hand follows.
2. Read a second zone on the 24-hour scale, using the two-tone unidirectional bezel to line home time (or destination time) against that hand.
3. When you change time zones, you move local hours; the 24-hour hand stays locked to them, so you re-index the bezel rather than setting a separate hour hand.

That is slower than a independently settable GMT if you hop cities every other day. It is plenty for Australian use: one home zone (AEDT/AEST or AWST) plus one travel zone, or office hours in another state. If you need to jump local hours without disturbing a second zone, look at a Seiko 5 Sports GMT instead of forcing this Mako to behave like one.

Sizing: Orient Mako GMT vs Kamasu and Mako 40

Do not copy “Mako” dimensions from an older generation. Case families differ.

Watch	Typical case	Lug-to-lug / thickness	Movement	GMT	Who it suits
Orient Mako GMT RA-BC000x	~42.8 mm (some retailers round to 42 mm), 22 mm strap	~49.5 mm / 13.4 mm	F6P22	Linked 24h hand + 24h bezel	Travellers who still want a 200 m sports case
Kamasu / Mako III (e.g. RA-AA081 / RA-AA082)	~41.8 mm, 22 mm strap	~46.8 mm / ~12.8 mm	F6922	No	Daily diver without extra hands
Mako 40 RA-AC0Q	39.9 mm, 20 mm strap	~46.5 mm / 12.8 mm	F6722	No	Smaller wrists, slimmer tool watch

The GMT is the largest of the three current Orient sports cases we stock. 13.4 mm is noticeable under a cuff; 49.5 mm lug-to-lug will crowd a 16 cm wrist. If you already found Kamasu slightly big, do not assume the GMT “wears the same.” If you wanted compact, start with a Mako 40 instead of this reference family.

Bracelet is 22 mm at the lugs with a folding clasp and safety — same strap ecosystem as Kamasu, so NATO and rubber swaps are easy once you confirm lug width on the watch in hand.

Which dial to pick

All four regulars are the same watch. Choose colour, not “the better spec.”

• Black RA-BC0001B — the default tool look; easiest with a suit-optional weekday and a weekend boat. Start here if you are unsure.
• Green RA-BC0002E — more character without going loud; reads sport, not novelty.
• Navy RA-BC0003L — the travel-friendly middle: dark enough for a desk, enough colour that it is not another black diver.
• Orange RA-BC0004Y — the one you buy because you want it seen. Fine if that is the point; skip it if you already own a loud bezel.

We currently have one of each regular at A$669. That is thin stock, not a warehouse. If a colour matters, buy that SKU rather than waiting for a restock rumour. The limited blue RA-BC0005L is listed but out of stock — we will not pretend it is a current cart option.

Orient Mako GMT vs Kamasu vs Seiko 5 Sports GMT

Buy the Mako GMT when you specifically want Orient’s in-house automatic, a 200 m sealed sports case, and a second timezone on a 24-hour bezel. It is a sports watch that gained a GMT, not a dress GMT in a dive costume.

Buy Kamasu when you do not need two zones. You save bulk, keep sapphire and 200 m, and stay in the size most Australian wrists already accepted on Mako III. Grey RA-AA0810N is a quieter daily than the orange GMT.

Buy Seiko 5 Sports GMT (SSK001J1 in stock; SSK005J1 orange also in stock) when the complication is the point: independently settable local time, a 24-hour chapter that is designed as a GMT first. You give up Orient’s 200 m sports case for a 100 m 5 Sports spec. That trade is honest; do not mix the two in your head.

Price-wise, the Mako GMT sits above everyday Kamasu and in the same conversation as a well-specced Japanese GMT. Compare the actual SKU on the site rather than a memory of 2023 Kamasu street prices.

Who should skip this Orient Mako

Skip it if your wrist is under ~16.5 cm and you already bounce off 42 mm sports watches. Skip it if you need a true independently settable GMT every week. Skip it if you wanted a certified ISO diver — Epson does not claim that, and neither should a retailer. Skip the limited if it is not in stock; a regular black or navy does the same job.

Keep it in the shortlist if you travel between Australian timezones or overseas a few times a year, you like Orient’s in-house movements, and you were already shopping a Mako-sized sports watch. For local Orient range beyond this model, start at Orient divers or the broader Orient watches category. Buying checklist for authenticity and dispatch is in where to buy Orient watches in Australia.

Authentic stock, inspected before dispatch. Free shipping Australia-wide on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page.