You can Calculate Current Market Estimated Price Here. This is an effort taken to keep the book aligned to Market where Bullion are drastically fluctuating.
NOTE:
Book Price Should Be ONLY from INDIAN COINAGE BOOK 2025-26 12TH EDITION.
1. You can calculate British India, Portuguese India and Republic India (Proof & UNC Sets)
2. Coins with Higher Grades such as XF and UNC have Higher Premium
3. This is Just an Estimate.