Casio G-Shock CasiOak Metal GM-2100 (GM-2100, GM2100, GM-2100-1A). Current Prices, JDM Listings, Market Analysis

The Casio G-Shock CasiOak Metal GM-2100 is the metal-cased evolution of the octagonal GA-2100 silhouette that earned the CasiOak nickname for its visual nod to a certain Swiss sports watch. Where the original GA-2100 leaned on resin, the GM-2100 wraps that same compact form in a metal bezel and case back, pushing it closer to dress-casual territory while keeping full G-Shock durability. Tonbo tracks the GM-2100 price because it sits at a credible arbitrage intersection , widely available in Japan and consistently sold at a premium on the US grey market. At a current US median of $300, it draws buyers looking for an accessible metal-accented G-Shock without paying boutique retail markups.

Current US Market Value

The US median for the Casio G-Shock CasiOak Metal GM-2100 GM-2100 sits at $300, with the interquartile range running from $240 to $380. That spread is meaningful , a $140 band across the middle half of transactions tells you condition and colorway drive significant price variation even within the same reference. It is worth flagging that this estimate is built on a sample size of six comparable transactions, which earns a yellow-flag comp quality rating from Tonbo. Six data points are enough to anchor a directional view of GM-2100 price, but not enough to treat the median as a hard floor. If you are buying or sourcing based on this data, build in some tolerance and watch for fresh transactions to either confirm or shift the range.

Active JDM Listings

Japan is showing consistent supply right now. A cluster of GM-2100 for sale listings appeared on Yahoo Flea Market and Yahoo Shop on June 15, spanning a range of asking prices and conditions. The concentration of same-day listings points to steady domestic liquidity rather than a dry spell or a sudden dump from a single seller.

• ¥21,900 on Yahoo Shop (condition unknown)
• ¥21,000 on Yahoo Flea Market (described as close to unused)
• ¥17,000 on Yahoo Flea Market (no noticeable scratches or stains)
• ¥13,990 on Yahoo Flea Market (described as close to unused)
• ¥13,280 on Yahoo Flea Market (no noticeable scratches or stains)

The range from ¥13,000 to ¥21,900 across listings with broadly similar condition language is a reminder that Japanese peer-to-peer pricing is not uniform. Two sellers both describing their piece as "close to unused" are asking ¥13,990 and ¥21,900 respectively. That gap is worth scrutinizing before committing to any buy GM-2100 Japan transaction.

Recent Alert History

No strict-buy or opportunity alerts have fired for the GM-2100 in the past 90 days. That is an honest read of the data, not a gap in coverage. It means the Japan-to-US price gap has not been wide or consistent enough during this window to trigger Tonbo's threshold-based signals. The model remains tracked and eligible for alerts if the spread opens up. You can see how Tonbo's signal logic works at tonbomarket.com/signals.

Japan vs. US Price Gap

At current exchange rates, the Japanese listings cluster mostly between roughly $85 and $145 USD landed before fees and shipping, against a US median of $300. That nominal gap is real, but it shrinks once you account for domestic Yahoo auction buyer fees, proxy service margins, international shipping, and the occasional customs notice. The primary risk factor here is not the platform or the process , it is condition variance. "No noticeable scratches" in Japanese flea market shorthand covers a wider range of actual wear than the phrase suggests in English, and with a metal bezel the GM-2100 shows contact marks more visibly than its resin sibling. The limited comp sample on the US side also means you are working with a softer price anchor than Tonbo would typically want before flagging a clean opportunity. Browse recent sourcing finds at tonbomarket.com/deals to get a feel for how similar gaps play out across other models.

Track Casio G-Shock CasiOak Metal GM-2100 on Tonbo

Tonbo's free Collector tier lets you add up to five models to your watchlist at tonbomarket.com/dashboard with no credit card required. The GM-2100 is a reasonable inclusion if you want to catch the moment the Japan-to-US spread crosses into genuine opportunity territory. Member tier at $10 per month adds real-time Discord alerts so you are notified when a signal fires rather than checking manually. If you are still building conviction on this model, the free tier gives you enough visibility to wait for the right window without any upfront cost.