Citizen Attesa Moon Phase Brown BY1004-17X (BY1004-17X, BY1004). Current Prices, JDM Listings, Market Analysis

The Citizen Attesa Moon Phase Brown BY1004-17X is a JDM-market Citizen Attesa variant distinguished by its brown dial configuration and moon phase complication. It surfaces regularly enough in Japan to attract arbitrage attention, and the BY1004-17X price gap between domestic Japanese listings and the US secondary market has been generating verified alerts in recent months. Tonbo tracks this reference actively because the spread between landed cost and US resale has cleared 25 percent gross margin on multiple recent transactions. The current US median sits at $500, though alert data suggests the realized market may be running closer to $750 for well-sourced units.

Current US Market Value

The US median for the Citizen Attesa Moon Phase Brown BY1004-17X is $500, with a middle-50-percent price band running from $400 to $600. That range is based on a sample of five verified transactions, which is a thin dataset. Comp quality is rated 🟡 Limited, meaning the $500 figure is directionally useful but should not be treated as a hard floor or ceiling. Notably, the recent alert history references a US median of $750 on triggered signals, which may reflect condition filtering or a separate sales channel skewing toward higher-grade pieces. Buyers researching BY1004-17X for sale in the US should weight both figures and account for the spread.

Active JDM Listings

Japan is showing consistent inventory for this reference right now. Six listings appeared on a single day in late May across Mercari Japan and Japanese marketplace platforms, with asking prices ranging from ¥70,000 to ¥114,590. That cluster at roughly ¥95,000 to ¥98,775 on multiple jp listings suggests the market has found a rough consensus around that band, while the Mercari outliers show the variance you should expect when sourcing. If you are looking to buy BY1004-17X Japan, the current supply is active enough that patient sourcing is viable.

• ¥95,000 on Mercari Japan, listed as excellent condition
• ¥70,000 on Mercari Japan, condition unknown
• ¥114,590 on Japanese marketplace platform, condition unknown
• ¥98,775 on Japanese marketplace platform, listed as excellent condition
• ¥96,250 on Japanese marketplace platform, condition unknown (two separate listings at this price)

Recent Alert History

Alert activity for the BY1004-17X has been consistent and meaningful. Four alerts fired within a four-day window in late May, split evenly between opportunity tier and strict tier signals. Landed costs on those alerts ranged from $474 to $553, against a US median of $750 used at the time of signal generation. Gross margin on those transactions spanned 26 to 37 percent before fees and time costs. The strict-tier alerts, which apply tighter condition and provenance filters, still cleared 29 and 37 percent respectively, which is a strong showing for a reference at this price point. You can review how Tonbo tiers its signals at tonbomarket.com/signals.

Japan vs. US Price Gap

The US-Japan gap on this reference is driven by the standard JDM dynamic: Citizen Attesa models with complications like moon phase are produced for the Japanese domestic market, distributed through Japanese retail channels, and do not reach US gray-market supply in large volumes. That restricted supply in the US keeps resale prices elevated relative to what patient sourcing in Japan can produce. The condition variance in the JP listing set is worth watching closely, given that two of the six recent listings carry unknown condition ratings and one Mercari listing came in nearly ¥25,000 below the cluster median, suggesting meaningful grade differences in available stock. Comp thinness on the US side adds a second layer of risk: with only five verified US comps, a single outlier transaction can move the median noticeably. Current deals being tracked are available at tonbomarket.com/deals.

Get Real-Time Alerts for Citizen Attesa Moon Phase Brown BY1004-17X

If the BY1004-17X price gap is something you want to act on rather than read about after the fact, Tonbo's alert system flags opportunity and strict-tier signals as they emerge from Japanese marketplace data. Paid plans with real-time alerts are detailed at tonbomarket.com/pricing. If you want to get a feel for how the signals work before committing, the free newsletter at tonbomarket.com covers selected JDM opportunities on a regular cadence. Given the active Japan supply and the margin history on this reference, it is a reasonable one to have on your watch list.