Generally, none of them, Omega, along with Tissot and Lemania became SSIH in the 1930's, predating the Speedmaster name by about 27(ish) years.
SSIH and ASUSG, another Swiss manufacturer, joined in 1983 to become SMH, now Swatch.
I'm not writing all the full names for SSIH, ASUSG or SMH here though!
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