Median recorded eBay sale price for each quarter with 3 or more sales. Dashed line marks the 2026 retail price.
Investment scorecard
Momentum69Measured price direction: the median recorded sale of the last 4 months against the median of 8 to 12 months ago. 50 means flat; small samples are pulled toward 50.
Liquidity67How easily it sells: recorded sales in the last 12 months (300 or more scores 100) and eBay's 90-day sell-through rate.
Scarcity19Demand against supply. For modern pieces, how far the market sits above or below current retail, plus a lift if production has ended. For vintage, how rarely one comes up for sale.
Value entry20Where the latest quarter's median sale sits inside its own 3-year range. Buying near the low scores high; buying at the high scores low.
Condition safety75How safe a typical example is: the age of the design, plus how tightly sale prices cluster (a wide spread means condition and originality swing the price).
The story
Tudor lists the Black Bay GMT S&G reference 79833MN at $8,125 in the US (tudorwatch.com, November 2026).
46 recorded eBay sales in the last 12 months, with a typical sale of $3,950.
Our verdict: Sells for about 51% under its $8,125 boutique price. 46 recorded eBay sales in the last 12 months, and prices are up 8% over the year.
How much is a Tudor Black Bay GMT S&G 79833MN worth?
Recorded eBay sales from the last 12 months put the typical Tudor Black Bay GMT S&G 79833MN at $3,950, with the middle half selling between $3,350 and $4,350 (46 sales). Condition, box and papers move the price within that range.
Does the Tudor Black Bay GMT S&G 79833MN sell above retail?
No. The typical sale of $3,950 is about 51% below the $8,125 retail price.
Is the Tudor Black Bay GMT S&G 79833MN a good investment?
The Crown Index grades it C (64/100) from real resale data, and today's call is watch. Middle-of-the-pack resale; fine to own, not one to buy expecting it to rise. Past prices are not a forecast.