Kamasu RA-AA0811B

The Kamasu is one of the few sub-$300 automatic divers built around a genuine in-house movement, and that fact alone separates it from most of the competition. 42mm, 200m water resistance, and bold dial options that actually sell out. If you want a capable daily sport watch without paying for a name, this is the honest answer.

What it is

Orient launched the Kamasu around 2019 as the sharper-edged counterpart to its long-running Mako line, targeting buyers who wanted something more visually assertive. The RA-AA0811B is the teal-dial variant, and it became one of the most discussed affordable divers on the forums almost immediately after release. Orient has been making movements in-house since the 1950s and has never outsourced that capability the way many mid-tier brands have, which is why the F6922 in the Kamasu is a feature, not marketing copy.

The Kamasu sits at the center of a genuinely competitive segment alongside the Seiko 5 Sports, but the in-house distinction is real and measurable. Production continues as of 2025, with Orient periodically refreshing the color lineup.

Buying notes

The F6922 runs at 21,600 vph, which is slower than modern movements and can show some sensitivity to positional variance. Accuracy out of the box is typically within COSC range but not guaranteed, and some examples need a quick regulation to get there. The bezel insert on the Kamasu is aluminum, not ceramic, so it will scratch with regular use.

The teal dial color photographs differently depending on light, and buyers occasionally find the in-person color cooler or more muted than product images suggest. Lume application is functional but not exceptional, which is a reasonable tradeoff at this price but worth knowing if night legibility matters to you.

Market read

New examples trade between $175 and $250 at major retailers, frequently discounted. The secondary market is thin because owners tend to keep them, but pre-owned examples in good condition rarely exceed $180, making the new price fairly defensible. The RA-AA0811B teal is the most sought-after Kamasu colorway, so you will pay a modest premium over burgundy or black variants.

Service expectations

The Orient F6922 is a cal. 40N5 family derivative, serviceably straightforward for any watchmaker familiar with Japanese movements. Full service intervals are typically 5 to 7 years with normal use. Orient's U.S. service center handles warranty work, and independent service is widely available given the movement's common architecture.