TWSBI — sold prices
2 tracked models, 151 completed eBay sales in the trailing 90 days. Medians are outlier-trimmed sold prices, not asking prices.
Modern core collectibles
| Model | Median (90d solds) | Sold / 90d | Range |
|---|---|---|---|
| 580 — Diamond | $70 | 26 | $50–$102 |
| Eco | $40 | 125 | $23–$80 |
Prices are 90-day medians of completed eBay sales, IQR-trimmed, with accessory and parts listings rejected. Condition, nib, box/papers and originality move individual pens well beyond any median — treat these as market context, not an appraisal.