You are right. See below.This surprises me, as I'd always assumed the proportion was somewhat higher than that.
There is actually a reasonable amount of information regarding which style Sobers was bowling, some of it in the comprehensive thread just linked.
For the first five years of his Test career he bowled only finger-spin; the next two seasons only wrist-spin.
His quicker style began in Australia in 1960-61 and largely dominated from then on, apart from the home series against India in 1962 when he bowled mainly wrist-spin. A shoulder injury in 1966 more or less put paid to the wrist-spin. So he reverted to finger-spin on slower pitches, usually in support of Gibbs. From this point Sobers would sometimes save his spin for the second innings.
The figures below are estimates only. Fewer wickets with spin than I assumed in the earlier post.
Quicker style: 147 wickets @ 31
Wrist-spin: 42 @ 33
Finger-spin: 46 @ 42
Total: 235 wickets @ 34
The numbers probably broadly reflect views of the relative merit of his three styles.
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