With reference to the ancient people of Harappan culture of Indus Valley, which one of the following statements is not correct?

The Harappan culture was a Bronze Age civilization that relied on a barter system and standardized weights rather than metal money. While they were highly advanced in metallurgy, working with copper, bronze, gold, and silver [c4, t3], there is no archaeological evidence of metal coins or currency. Instead, Harappan seals made of steatite were used to identify property and stamp trade goods [c2, t3]. Regarding the other options: spindle whorls made of terracotta and stone have been unearthed, confirming the practice of spinning [t1]. Evidence of boat-making and maritime trade is well-documented, particularly through the discovery of the dockyard at Lothal and depictions of ships [t3, t10]. Furthermore, despite their knowledge of metals, the Harappans continued to use a variety of stone tools, such as chert blades and flints, for agriculture and craft production [c1, t4].

Sources

1. [1] History , class XI (Tamilnadu state board 2024 ed.) > Chapter 1: Early India: From the Beginnings to the Indus Civilisation > Metals, Tools and Weapons > p. 12
2. [2] THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.) > Chapter 1: Bricks, Beads and Bones > Bricks, Beads and Bones The Harappan Civilisation > p. 1
3. [3] History , class XI (Tamilnadu state board 2024 ed.) > Chapter 1: Early India: From the Beginnings to the Indus Civilisation > Craft Production > p. 11
4. [4] https://unesdoc.unesco.org/ark:/48223/pf0000094486