The V-93S was a modified model of the Vought O3U-6. The V-93S was sold to Siam,  in 1934,  for use as a two-place fighter aircraft. Twelve of the V-93S aircraft were manufactured by Vought. The last four had provisions for four Vickers machine guns. All armament installations were made by the Siamese. Seventy two additional V93S aircraft were manufactured by the Siamese under license. The quantity equipped with floats by the Siamese is unknown.

In 1978, a V-93S in the Royal Thai Aviation Museum was the oldest Vought aircraft in existence.