FX regime · 1 September 1975
Rupee moves from sterling peg to a basket peg
Ended the formal sterling link
ReportedOfficial record. Source: RBI
London gold / US gold · 6 January 1975
US Treasury gold auction (the prompt's "1974 gold auction")
2 mn oz offered; bids covered less than half; stop-out USD 153/oz against a London morning fix of USD 173/oz. A second sale on 1975-06-30 brought the total to 1.25 mn oz sold at USD 153–185/oz.
Not an Indian auction. I found no Indian government or RBI gold auction in 1974.
ReportedOfficial record. Source: TIME archive; U.S. Mint history; IMF F&D vol. 15 no. 1 (1978) "Gold market developments, 1975-77"
Political risk · 12 June 1975
Allahabad High Court voids Indira Gandhi's 1971 election (Raj Narain case)
Led directly to the Emergency.
ReportedOfficial record. Source: Allahabad HC judgment
Labour, prices, press · 25 June 1975
National Emergency declared (Art. 352, internal disturbance), lifted 1977-03-21
Strikes banned; price controls and anti-hoarding drives. Inflation fell sharply in 1975-76 after a good monsoon and monetary tightening.
Macro figures belong in the MACRO slice.
ReportedOfficial record. Source: Emergency proclamation; Frankel 2005
Official gold / London gold market · 31 August 1975
IMF Interim Committee gold agreement
Agreed to abolish the official gold price and dispose of 50 mn oz of IMF gold: 25 mn oz restituted to members pro rata to quota and 25 mn oz auctioned for the Trust Fund. Ratified in Jamaica 1976-01.
This is the only documented "1975 link" between the IMF and the gold market. It fed the 1976-80 auctions and the Trust Fund, not the oil facility. India, as a member, was due restituted gold pro rata to its quota. India's tonnage was not found.
ReportedOfficial record. Source: IMF "Gold in the IMF" factsheet; IMF History 1972-78 ch. 34
INR · 24 September 1975
Rupee moved from a sterling peg to an undisclosed basket peg
Weights not published. Sterling kept as the intervention currency.
Band and weights were at RBI discretion.
ReportedOfficial record. Source: MoSPI Statistical Year Book ch. 40; Wikipedia "Exchange rate history of the Indian rupee"