It's the second one. March 5, 1968.
Thanks. I've loved this piece since I was in high school in the 1970s, and I'll offer a few observations about performing options and notable recordings.
Berlioz specified low-pitched bells in the last movement. The score shows the bells playing at middle C and two octaves below, far into the bass range. Many performances use tubular chimes, which cannot reach that low, some even playing an octave too high. In his own performances when on tour, Berlioz substituted at least one piano if suitable bells were not available, and that option is noted in the score. I'm perplexed that someone making a recording in our era, with so many competing versions available and evidence both in the score and in historical documents, would use tinny-sounding chimes. Musical malfeasance, I say, or at least, misfeasance.
One of the first SF LPs I owned features Dimitri Mitropoulos and the New York Phil from 1957, a great performance. Mitropoulos appears to have used one bell or chime doubled by piano(s), and its a wonderful effect. Of more recent recordings, Jos van Immerseel with Anima Eterna Brugge employs apparently two pianos, sounding fantastically ominous. While the finale is particularly effective, earlier sections aren't played with much intensity, though the recording is blessed with other virtues as noted below, and anyone who loves SF should hear it.
Berlioz also added an obbligato cornet part to "Un bal" in his manuscript copy, though it wasn't included in a published version during his lifetime. In recent years it's become common to include it, Berlioz stalwart Colin Davis included it in his 1974 Amsterdam and 1990 Vienna recordings, and quite possibly in the numerous others he made.
Of "classic" recordings, Paul Paray and the Detroit Symphony and Ormandy/Philadelphia are particularly effective. Neither includes the reapeats in I and IV or the cornet in II. Ormandy in particular was a surprise to me, hearing it again after many years, because it's extraordinarily well characterized and even includes respectable bells. Another great one is Georges Prêtre with the Boston Symphony, a performance of great verve and energy, though with a few quirks, such as a bass drum roll on the last note.
Both the Immerseel recording and Daniel Harding with the Swedish Radio Symphony check all the boxes: Both repeats, cornet, and effective bells (Harding) or pianos. Further, both seat the low strings on the left and divide the violin sections on opposite sides of the stage. Both also seat the harps on opposite sides, though the (marvelous) effect is more pronounced in Immerseel. In some passages Berlioz tosses swirlling figures back and forth between the violin sections and it is hard to believe that he didn't intend the sections to be seated antiphonally. Note that Bernstein, at least in 1963, also divided the harps.
Harding is my favorite among modern recordings, not only because it checks all those boxes but is a spirited performance besides. It may seem odd that it's coupled with music by Rameau from a century earlier, but that performance too is outstanding and the booklet notes explain the commonalities.