Seiko Prospex Turtle SRPC25 Black (SRPC25, SRPC25K1). Current Prices, JDM Listings, Market Analysis

The Seiko Prospex Turtle SRPC25 Black is a dive watch from Seiko's long-running Turtle line, sold under reference numbers SRPC25 and SRPC25K1. It sits within the broader Prospex family that Seiko positions as its serious tool-watch segment, and the blacked-out colorway has drawn consistent attention from buyers who want a purposeful aesthetic alongside proven dive credentials. Tonbo tracks this model because it circulates regularly in the Japanese domestic market at price points that can differ meaningfully from US retail and resale levels. At a current US median of $310, the SRPC25 occupies an accessible tier of the JDM dive watch market worth monitoring closely.

Current US Market Value

The current US median price for the Seiko Prospex Turtle SRPC25 Black is $310, with the middle 50 percent of transactions landing between $250 and $390. That $140 spread is relatively wide for a single reference, which suggests condition and seller context are doing real work in determining where any individual example lands. It is important to note that the SRPC25 price estimate here is based on a sample of only four data points, sourced through operator estimation rather than a large pool of confirmed sales. The comp quality rating is orange, meaning estimate only. Treat these figures as directional benchmarks rather than settled market data. As more transactions are confirmed and added to the dataset, confidence in these figures will improve. For a live view of how signals are developing across comparable models, see the Tonbo signals tracker.

Active JDM Listings

There are no active Japanese market listings for the SRPC25 in the past 14 days within Tonbo's monitored sources. That absence does not mean inventory does not exist in Japan, only that no qualifying listings surfaced during this specific window. The Turtle line in general moves in irregular cycles on Japanese platforms, and gaps of two to three weeks between trackable listings are not unusual for specific colorways like the black dial variant. When listings do appear, they tend to surface on the major Japanese auction and marketplace platforms that Tonbo monitors. Key things to watch for when supply returns:

• Whether the listing includes the original box and papers, which typically adds $30 to $60 to the effective ask
• Seller rating and transaction history, especially for private listings versus established dealer accounts
• Photos of the bezel insert, where wear is most visible on used examples
• Stated service history or any mention of crown or pushpiece condition
• Whether the reference listed matches SRPC25 or SRPC25K1, as regional variants can affect parts availability

Recent Alert History

No strict or opportunity alerts have fired for the Seiko Prospex Turtle SRPC25 Black in the past 90 days. This means no listings have cleared the threshold criteria Tonbo uses to flag either a strong deal relative to the US market or a confirmed below-floor pricing event. Given the thin comp base and the gap in recent JP listings, this is not surprising. It reflects a period of low observable activity rather than a conclusion about the model's long-term opportunity profile. Buyers who want to be notified the moment a qualifying SRPC25 for sale appears in Japan can set a watch through Tonbo's deals feed.

Japan vs. US Price Gap

The US-Japan price gap on models like the SRPC25 is typically driven by a combination of domestic Japanese supply depth, the yen's current position against the dollar, and the willingness of Japanese sellers to list at prices calibrated to local demand rather than export value. For a mid-tier Prospex in a specific colorway, buyers who source directly from Japan and account for shipping, proxy fees, and import duties can sometimes land the watch at the lower end of the US range or below it, though the margin on a $310 median is not large. The main risk here is comp thinness. With only four data points underlying the current estimate, there is genuine uncertainty about where a fair US resale price actually sits, and a buyer who overpays in Japan on a thin-margin deal has limited room to recover value on the secondary market.

Get Real-Time Alerts for Seiko Prospex Turtle SRPC25 Black

If you are watching the buy SRPC25 Japan opportunity, the most practical step is setting up an alert so you are notified when qualifying listings appear rather than checking manually. Tonbo's alert tiers are explained at tonbomarket.com/pricing, and a free newsletter with periodic JDM market updates is available at tonbomarket.com. Given the current low listing activity and thin comp base, alerts are the right tool here. Waiting for a stronger signal before committing is a reasonable position.