Oceanica Watch Co. ThreshervsSeiko Prospex Sea Save the Ocean Special Edition

Owners widely praise the Oceanica Watch Co. Thresher for its specifications, lume, sapphire crystal, and screw-down crowns. One owner notes the font on the insert and indices are directly taken from the IWC Aquatimer. A previous generation had an issue with the internal bezel rotating even when the crown was screwed down. Overall, owners rate the Oceanica Watch Co. Thresher highly for its impressive specifications and lume at its $250.00 price point.

The Seiko Prospex Sea Save the Ocean Special Edition is widely praised for its attractive, unique, and textured dials, often described as having a "Grand Seiko feel" at a more accessible price point, with specific mentions of wave patterns, lagoon hues, and manta ray motifs. Owners appreciate the smooth bezel operation and satisfactory lume. Accuracy figures vary, with one owner reporting +5 seconds per day, while another notes a range from +1/+2 to about -6 seconds per day. The 6R35 movement offers a 70-hour power reserve, and some models feature sapphire crystals. Criticisms include a desire for exhibition casebacks and concerns about the quality and security of the stamped metal clasps and bracelets, which are frequently described as rattly or underwhelming, though this is noted as a common Seiko trait. Some owners are split on the number of Save the Ocean variations and dislike the cyclops magnifier.