The cited source records the Birlas starting as brokers in the Calcutta office of Tarachand Ghanshyamdas.
The Ledger · families
Marwari Business Families Recorded as Starting in Broking
Families the record shows beginning as brokers in nineteenth-century Calcutta, listed alphabetically. Seed content — AI-drafted prose, to be replaced by the maintainer. Citations are real.
Two Marwari business families are documented as beginning in broking in nineteenth-century Calcutta: the Birlas, in the office of Tarachand Ghanshyamdas, and the Sarafs, in the person of Nathuram Saraf.
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Forbes India records Nathuram Saraf working as a broker with Kinsell and Ghosh, and Nakatani calls him the first Marwari broker to foreign firms.