The best workmanship I have seen where multicellular cell throats join together is on the earliest Lansing horns circa 1936-37. The cell throats were soldered together then hand filed to meticulous knife edges. Most tar filled Altec multis are also pretty good.
I was able to inspect some Fletcher System horns years ago, the world's first multicellular horns built at Bell Labs in 1932, and the throat junctions were kinda rough!
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