This is the 50 paise coin of 1978, struck in copper-nickel at the Bombay Mint for Republic India. Collectors track individual date-and-mint combinations closely, and this particular year is one that draws attention among fifty paise pieces.
Older definitive coins in high grade are harder to find because most were spent and worn in daily use. A clean, lustrous example with sharp detail is what serious collectors look for, and it sits well above a heavily circulated coin. As with any coin, value depends on the grade, the mint and overall condition — not the denomination alone.
Coinbazzar lists verified 50 paise coins with images, so you can judge the surfaces and detail before buying the exact piece shown on this page.