The unknown study of Vasily Surikov (?). «Portrait of strelйts from the collection of the museum of Russian culture in San Francisco

An information about an unpublished study of Strelets by Vasily Ivanovich Surikov for his painting «Morning of Streltzi's execution», that has been in the Russian Museum in San Francisco since 1952, with a brief description, current condition and a general comparative and stylistic analysis of its authenticity.