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In the 1930s, to measure performance in stadiums, the smallest chronograph models were 13 lignes (about 29 mm), which, at the time, was considered too large for women.
Several chronograph movements were introduced in the mid-1930s by Venus, Arogno, and Dépraz; they were compact in size, with some measuring 10.5 lignes (23.70 mm), but these small chronographs did not have a minute counter.
It was actually in 1936 that a remarkable 10.5-line (23.7 mm) caliber was introduced, which would finally make it possible to launch chronograph watches for women: the Valjoux 69 caliber.
Read more here.