Price Guide · Method SPG-0.1.0
How values are
worked out.
Every value in the guide follows the same published steps, so anyone can check our work.
- Only real, verified sales count. Completed sales in US dollars for an exact match. Asking prices and unverified sales are shown but never used.
- Shipping is separated and multi-item lots are divided per item.
- Each sale is adjusted to mint-like condition using the condition factors below, so sales in different conditions can be compared.
- Recent sales count more. A sale's weight halves every 12 months.
- The range is the middle of the evidence (25th–75th percentile), then adjusted to the condition you pick.
- At least 3 usable sales are needed. Fewer than that shows “Not enough data yet”, never a guess.
- Confidence is High with 8+ sales in the last year, Medium with 5+, otherwise Low.
Condition grades
| Grade | What it looks like | Factor |
|---|---|---|
| A · Mint-like | Unused appearance, clean, original tags or packaging. | 1.00 |
| B · Excellent | Light handling, no material damage. | 0.85 |
| C · Good | Visible use, minor wear or a fixable issue. | 0.65 |
| D · Fair | Stain, notable wear, deformation or missing tag. | 0.40 |
| E · Poor | Major damage, repair, odor or incomplete. | 0.15 |
These factors are starting values and will be re-tested against real sales. When the method changes, the version number changes and the change is explained here.