I was born in 1951 and began training as an altar server in 4th. grade as I recall. My recollection of the bells at the Consecration is 1-3-1, but that was a long time ago.
The Saint Joseph Daily Missal 1951 Edition says “After pronouncing the words of Consecration, the Priest genuflects, and adores the Sacred Host. He then rises, elevates It, and replaces it upon the corporal, genuflecting once again. The bell rings once for each act of adoration”. I presume the “act of adoration” is the genuflection. The same is written for the Consecration of the wine.
The St. Andrew Daily Missal 1958 Edition does not mention bells (nor does it show a bell image) at the Sanctus, the Hanc igitur, nor the Consecration.
The Saint Joseph Daily Missal 1961 Edition is imprecise. It says “After pronouncing the words of Consecration, the Priest genuflects, and adores the Sacred Host. He then rises, elevates It, and replaces It upon the corporal, genuflecting once again. The bell rings once for each act of adoration”. At the elevation of the Host three bells are shown. At the Consecration of the Wine (on the Latin side of the page) bells are not mentioned nor shown. On the English side of the page, at the conclusion of the Consecration of the Wine, all it says is “The Priest adores the Precious Blood: you do likewise. The bell rings 3 times".
I have a book called “Matters Liturgical” (The Collectio Rerum Liturgicarum of Rev. Joseph Wuest, C.SS.R.). It was first published in Latin in 1889 and the first English translation was made in 1925 by Rev. Thomas Mullaney, C.SS.R. My copy is the Eighth English edition, re-arranged and enlarged by Rev. William Barry, C.SS.R, S.S.L in 1955. It says “At each Elevation after the Consecration the altar bell shall be rung either three times or continuously. This rubric is variously interpreted. But a widely accepted practice is to ring the bell at the genuflection before the Elevation, at the Elevation itself, and at the genuflection after the Elevation". How many times the bell is or should be rung at the genuflection is not stated. The book gives this reference: S.L.P.: I, B. 251; L. O’Connell: P. 166 but I didn't find what exactly this reference is, though I didn't look too hard either.