Longines HydroConquest 43mm Green vs Seiko Prospex Street Series Tuna S23629

In-Depth Comparison

The Longines HydroConquest 43mm Green and the Seiko Prospex Street Series Tuna S23629 represent two compelling options in the luxury watch market. Both timepieces have earned devoted followings among collectors and enthusiasts, but they approach horology from distinctly different perspectives. Let's break down how these two watches compare across the key dimensions that matter most to buyers.

Heritage And Brand Prestige

Longines and Seiko are both highly respected names in watchmaking. The Longines HydroConquest 43mm Green comes from Switzerland, while the Seiko Prospex Street Series Tuna S23629 originates from Japan. This particular HydroConquest reference was introduced in 2023, while this Prospex reference debuted in 2022. The Longines HydroConquest 43mm Green is the newer release, potentially featuring more modern technology and finishing.

Movement And Mechanics

At the heart of the Longines HydroConquest 43mm Green beats the L888.5 caliber offering a 72-hour power reserve running at 25,200 vph with 21 jewels. The Seiko Prospex Street Series Tuna S23629 is powered by the V157.

Dimensions And Wearability

The Longines HydroConquest 43mm Green features a 43.0mm case at 14.0mm thick with a 50.0mm lug-to-lug measurement, crafted in Stainless Steel. The Seiko Prospex Street Series Tuna S23629 comes in at 46.7mm and 12.6mm thick with 50.0mm lug-to-lug, constructed from Stainless Steel with shroud. The Longines HydroConquest 43mm Green wears more compactly on the wrist, making it potentially more suitable for smaller wrists or those who prefer understated proportions. At 145g, the Seiko Prospex Street Series Tuna S23629 is the lighter of the two.

Materials And Construction

The Longines HydroConquest 43mm Green uses a Sapphire crystal paired with a Rotating Ceramic bezel, while the Seiko Prospex Street Series Tuna S23629 features Hardlex crystal with a Rotating bezel. On the wrist, the Longines HydroConquest 43mm Green comes on a Rubber strap with Fold-over, while the Seiko Prospex Street Series Tuna S23629 is fitted with Silicone strap featuring Buckle.

Water Resistance And Capability

The Longines HydroConquest 43mm Green is rated to 300m / 984ft and the Seiko Prospex Street Series Tuna S23629 to 200m / 656ft. For serious diving or water activities, the Longines HydroConquest 43mm Green offers a meaningful advantage.

Pricing And Value

At retail, the Longines HydroConquest 43mm Green lists for $1,700 compared to $425 for the Seiko Prospex Street Series Tuna S23629. The Seiko Prospex Street Series Tuna S23629 is the more accessible option at MSRP, saving $1,275 at retail. On the secondary market, the Longines HydroConquest 43mm Green trades around $1,400 while the Seiko Prospex Street Series Tuna S23629 commands approximately $340.

The Verdict

Choosing between the Longines HydroConquest 43mm Green and the Seiko Prospex Street Series Tuna S23629 ultimately comes down to personal priorities. For diving and water sports, the Longines HydroConquest 43mm Green is the stronger choice. Both watches are exceptional timepieces that will serve their owner well for generations. We recommend trying both on the wrist at an authorized dealer before making your final decision, as comfort and emotional connection are ultimately just as important as specifications.