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- Age and Era: Determine the age of the postcards. Older postcards (pre-1920s) are generally more valuable. Look for postmarks, printing styles, and historical context clues.
- Condition: Assess the overall condition. Mint or near-mint condition postcards are most valuable. Check for creases, tears, discoloration, and wear.
- Rarity: Research the rarity of each postcard. Limited editions, discontinued series, or postcards from short-lived events can be more valuable.
- Historical Significance: Consider the historical context. Postcards depicting important events, notable figures, or significant locations often hold more value.
- Artistic Merit: Evaluate the artistic quality. Postcards by renowned illustrators or photographers, or those with unique artistic styles, can be more desirable.
- Topical Appeal: Identify popular collecting themes (e.g., holidays, transportation, specific locations). Some topics have dedicated collector bases, potentially increasing value.
- Publisher and Printer: Research the postcard’s publisher and printer. Some companies are known for high-quality or collectible postcards.
- Material and Technique: Consider the postcard’s material and printing technique. Real photo postcards or those with special finishes (e.g., embossed, gilt) can be more valuable.
- Completeness of Sets: Check if the postcards are part of a series. Complete sets often hold more value than individual cards.
- Market Demand: Research current market trends. Popularity of certain themes or styles can fluctuate, affecting value. Consult recent auction results or price guides for similar postcards.
Remember: While these tips can help in evaluation, consulting with a professional appraiser is recommended for accurate valuation, especially for potentially valuable collections.