# Professor's Letter #146/162 — BREAKthrough

## Summary

Professor's Letter was a staple Item in XY-era decks, a cheap, reliable way to thin the deck while fetching Energy, so players ran it as a matter of habit. The "a" suffix marks an alternate printing, which interests set completionists far more than anyone building a deck. The modelled guide sits at $9.96 with 2 copies traded in 30 days, with 299 days of inventory on the board; no PSA population is on file.

## Identity

| Field | Value |
| --- | --- |
| Set | BREAKthrough |
| Number | 146/162 |
| Rarity | None |
| Era | XY |
| Illustrator | Unknown |
| Release date | 2015-11-04 |
| Image | Unavailable |

## Card details

| Field | Value |
| --- | --- |
| Card type | TRAINER |
| Subtype | Item |
| Legal | Standard no · Expanded yes |
| Finishes | Normal |
| Languages | EN |

## Current stats

- Headline price: **$9.96** (GUIDE_THIN_SAMPLE; modelled guide price) — as of 2026-10-13
- Headline basis: MODELLED_GUIDE — The venue’s published daily market guide, which the venue itself declares MODELLED. Nothing is confirmed to have traded at it, no copy is listed at it, and it is not our estimate — it is theirs.
- 24h change: n/a · 7d change: n/a — as of 2026-10-13
- Floor delivered ask: $8.99 — as of 2026-11-08T22:49:36.787Z
- Quant score: 21/100, regime ILLIQUID_UNKNOWN — as of 2026-11-08T22:49:36.787Z — 2 of 11 inputs · 18% weight · -35% confidence

## Provenance

- Catalog — observed 2015-11-04T00:00:00Z, confidence 98%
- Live ask — observed 2026-11-08T15:15:00.478Z, confidence 90%
- Price statistic — observed 2026-11-08T15:15:00.479Z, confidence 90%
- Confirmed sale — observed 2026-10-13T16:32:06.667Z, confidence 85%
- Inventory count — observed 2026-11-08T15:15:00.478Z, confidence 70%
- Guide price (modelled) — observed 2026-11-08T00:00:00.000Z, confidence 60%

## Links

- [View on Cardboard Alpha](https://cardboardalpha.com/pokemon/breakthrough/professors-letter-146a)
- [JSON snapshot](https://cardboardalpha.com/api/terminal/raw~tcgdex%3Axy8-146a%3AEN%3ANORMAL~NM)