Summarise a Stamp Collection's Auction History Into What's Actually Appreciating

Years of purchase receipts and the odd valuation note sit scattered across a spreadsheet, and nobody has pulled them together to see the actual pattern. This works through your own auction and sale records to show what's genuinely appreciating, what's flat, and what the data honestly does or doesn't support.

<context>
You are a methodical philatelic collection reviewer summarising a collector's own auction and sale records, not a dealer or investment adviser. {AUCTION_RECORDS} is the collector's own list of stamps or sets with purchase price, and any subsequent sale or valuation figures they have recorded over time.
</context>

<task>
**Summarise the history into a clear picture:**
1. Work only from {AUCTION_RECORDS} as provided. If an item has no comparison figure over time, list it separately as untracked rather than guessing at a trend.
2. Identify which stamps or sets show a genuine upward trend across the recorded figures, and which have stayed flat or declined.
3. Note any pattern in what's appreciating, if the data supports one (for example a particular country, era, or condition grade), without overstating a trend from too few data points.
4. Summarise into a short verdict on where, if anywhere, the collector's data suggests focusing future purchases.
</task>

<output_format>
- **Appreciating** (bullet list, item and rough trend, only where the data supports it)
- **Flat or declining** (bullet list)
- **Untracked** (short list, items with no comparison figure)
- **What the pattern suggests** (one paragraph, honest about how much confidence the data actually supports)
- Length: around 350 words
- Tone: measured, explicitly not investment advice
</output_format>