Here are some factors that could affect its worth:
1. Condition: The condition of the original book is crucial. A well-preserved copy with minimal damage to the cover, spine, pages, and overall structure will be more valuable than one with significant wear and tear.
2. First Edition: If the 1904 copy you have is a first edition, especially in very good condition, its value increases significantly. First editions hold special importance for collectors and the value of a first edition book can be several folds higher than subsequent editions.
3. Publisher: The publisher of the original edition also plays a role in its value. An original copy published by the original publisher in 1904 may be more desirable and valuable than reprints or later editions.
4. Provenance: If the book has a known history or provenance, such as a notable previous owner, a personal inscription by the author, or a limited number printed, it can add additional value.
5. Market Demand: The value of rare and collectible books is often influenced by market demand and supply. If there is a high demand for original copies of "As a Man Thinketh" among book collectors, its worth can be higher.
6. Rarity: The scarcity of the book can significantly affect its value. If it is a limited or rare first edition, with few copies available, its value can be notably higher.
7. Completeness: A complete copy with all its original pages, illustrations, and any additional materials (if originally included) will be more valuable than incomplete versions.
Based on these factors, the value of an original copy of "As a Man Thinketh" from 1904 could range from a few hundred to several thousand dollars. However, it is always recommended to consult with rare book experts, auction houses, or professional book appraisers for an accurate valuation of your specific copy.