Quick take: The Orient Bambino Helios Open Heart RA-AG0026E10B is a green-dial automatic dress watch with an open-heart aperture, about 40.5 mm steel case, in-house F6T22 movement (hand-wind and hacking), domed mineral crystal, and a stainless bracelet. It suits office and evening wear — not swimming — and sits in Orient’s mechanical dress family rather than the Kamasu diver line.
If you have been hunting an Orient Bambino that shows some of the movement without jumping to a full skeleton, the Helios open-heart references are the usual answer. RA-AG0026E10B pairs a green dial with a cut-out above six o’clock so you can watch the balance run. This guide covers who it fits, the specs that matter on the wrist, and how it compares with closed-dial Bambinos Australian buyers usually shortlist next.
What the RA-AG0026E10B actually is
Orient’s Bambino family is built around classic dress proportions: modest thickness for the category, domed crystal, and dials that work with a shirt cuff. The Helios open-heart variants keep that silhouette and add a window onto the balance wheel. On RA-AG0026E10B you get:
- Reference RA-AG0026E10B (Helios / Bambino open-heart family)
- Green dial with open-heart aperture; silver-tone hands and markers
- Orient calibre F6T22 — automatic, hand-winding, hacking seconds
- Power reserve around 40 hours
- Stainless steel case about 40.5 mm across, roughly 12 mm thick, lug-to-lug near 46 mm
- 21 mm lug width
- Domed mineral crystal
- 30 m water resistance (splash and hand washing only)
- Stainless steel bracelet with fold-over clasp on the stock configuration we list
Live product page: Orient Bambino Helios Open Heart RA-AG0026E10B.
Who this Helios Bambino suits
Choose RA-AG0026E10B if you want mechanical presence on a dress watch without a thick dive case. The open heart is a conversation detail at a desk or dinner; it is not a sports complication. Green dials also read more distinctive than black or white under office LEDs, which is why this reference keeps showing up in “not another black dial” shortlists.
Skip it (or at least pair it with a tool watch) if you need swimming, surfing, or hard weekend abuse. Thirty metres is dress-watch water resistance. For 200 m class Orient sports pieces, look at Kamasu instead — for example the RA-AA0811E19B green-gradient Kamasu — and read the Kamasu Australia guide.
| Spec | RA-AG0026E10B |
|---|---|
| Type | Automatic dress / open heart |
| Movement | Orient F6T22 (auto, hand-wind, hacking) |
| Case | ~40.5 mm steel |
| Crystal | Domed mineral |
| Water resistance | 30 m |
| Dial | Green, open heart |
| Bracelet | Steel, fold-over clasp (as listed) |
Helios open heart vs closed-dial Bambino
A standard Bambino keeps a full dial and often ships on leather. That looks quieter under a cuff and can feel lighter if you prefer straps. The Helios open heart trades some of that simplicity for movement theatre and, on this reference, a full steel bracelet look.
If you like the green idea but want a closed dial, compare Orient Bambino RA-AC0023E green dial. If you want a clean silver-white no-date dress automatic around a slightly more compact modern Bambino size, see RA-BB0002S30B. Version naming across Bambino generations is messy — use the Bambino Australia buying guide before you fixate on marketing nicknames.
Wearing and caring for RA-AG0026E10B
At about 40.5 mm the case is mainstream for men’s dress watches in Australia. Lug-to-lug near 46 mm matters more than diameter if you have a smaller wrist — try to visualise overhang past the wrist bone. The F6T22 can be hand-wound and hacks, which makes setting the time less fiddly than older no-hack Orient calibres.
Practical care:
- Wind a few turns if the watch has sat still past the power reserve.
- Keep water exposure to rain and washing hands; no pool or ocean.
- Mineral crystal can scratch — store it away from keys and other watches.
- Bracelets pick up desk rash; that is normal steel behaviour, not a defect by itself.
This reference
Green open-heart Helios on steel when you want the balance wheel visible and a dress-sports hybrid look.
Closed green Bambino
Prefer a full dial and classic Bambino face without the open heart cut-out.
Clean silver dress
Silver-white no-date automatic for shirts and understated evenings.
More Orient dress stock
Browse the wider Orient and dress-watch catalogues when this SKU is not the right size or colour.
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. For brand-level context on Japanese automatics, also see Orient vs Seiko and the wider articles hub.
Frequently asked questions
What is the Orient Bambino Helios RA-AG0026E10B?
It is a Japanese automatic dress watch in the Bambino / Helios open-heart family with a green dial, roughly 40.5 mm steel case, F6T22 movement, and steel bracelet on the configuration we list in Australia.
What movement does the RA-AG0026E10B use?
Orient’s in-house F6T22. It winds automatically on the wrist, can be hand-wound, and hacks (seconds stop when the crown is pulled for setting). Power reserve is about 40 hours.
Is the RA-AG0026E10B good for swimming?
No. Rated 30 metres, it is fine for rain and hand washing, not for swimming or diving. Choose a 200 m diver such as a Kamasu if water sports are part of the brief.
How does the open-heart Helios differ from a normal Bambino?
The open-heart dial exposes the balance wheel through an aperture. Closed-dial Bambinos keep a full face and often feel more traditional under a cuff. Specs like case size and mineral crystal still sit in the same dress-watch neighbourhood.
Where can I buy the Orient RA-AG0026E10B in Australia?
When in stock, from Chronospride’s product page for the RA-AG0026E10B, or browse related pieces under Orient and dress watches.