Which is cheaper, the Astor + Banks Fortitude Lite or the Seiko Prospex Sea?

At MSRP the Astor + Banks Fortitude Lite is the cheaper of the two at $650, against $1,500 for the Seiko Prospex Sea — a $850 gap before any retailer discounting.

Which is bigger, the Astor + Banks Fortitude Lite or the Seiko Prospex Sea?

The Seiko Prospex Sea wears larger at 43.5mm versus 38.5mm for the Astor + Banks Fortitude Lite — a 5mm difference across the dial.

Which has a longer power reserve, the Astor + Banks Fortitude Lite or the Seiko Prospex Sea?

The Seiko Prospex Sea carries a 70-hour power reserve against 40 hours on the Astor + Banks Fortitude Lite.

What movement does the Astor + Banks Fortitude Lite run compared to the Seiko Prospex Sea?

Both watches run automatic movements — the Astor + Banks Fortitude Lite uses the Miyota 9039 and the Seiko Prospex Sea uses the 6R35.

Side by side

Astor + Banks Fortitude LitevsSeiko Prospex Sea

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

The bottom line

The 38.5mm Fortitude Lite wears 5mm narrower than the 43.5mm Prospex Sea — that's a meaningful jump on most wrists.

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Astor + Banks Fortitude Lite

The Astor + Banks Fortitude Lite is praised for its reduced 10.9mm thickness and redesigned lugs that turn down, along with the removal of the date complication. One owner finds the white dial Fortitude Lite a good watch but not worth $650, suggesting better value from other brands, while another simply states it looks better than a specific alternative. Overall, owners praise the Astor + Banks Fortitude Lite for its wearability due to its thinner case and redesigned lugs.

WatchUSeek

Seiko Prospex Sea

Seiko Prospex Sea owners and reviewers praise its Marinemaster-style aesthetic, excellent case finishing, and impressive LumiBrite lume. The watch is powered by the 6R15 movement with a 50-hour power reserve and comes with both a steel bracelet and a silicone strap. Some owners find the Seiko Prospex Sea to be a great value and a suitable first "proper" watch, while others report it is uncomfortably big, thick, and heavy on smaller wrists. Reviewers note the GMT function is secondary with a less prominent scale, and the bezel's quieter clicks may not appeal to all. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its classic design and finishing at its price point.

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