Русский: "Ф. В. Токарев с сыном Николаем у ручного пулемета системы Максима-Токарева образца 1925 г." или еще "Токарев с сыном в первом помещении КБ ТОЗ. 1925 г."
http://www.opoccuu.com/tokarev-s-synom.jpg also appears in the book Болотин, Давид (1995) История советского стрелкового оружия и патронов, Полигон, 国际标准书号5-85503-072-5, on p. 168 (different cropping) the version with the same cropping as here is labeled "Токарев с сыном в первом помещении КБ ТОЗ. 1925 г. (фото из собрания ВИМАИВ и ВС)" in an article from Kalashnikov magazine 2011/6, p. 32
This work is in the public domain in the United States because it meets three requirements:
it was first published outside the United States (and not published in the U.S. within 30 days),
it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
it was in the public domain in its home country on the URAA date (January 1, 1996 for most countries).
Note that in 1996 (US URAA date) in Russia their 1993 law was in force. This granted copyright 50 years p.m.a. or 50 years from date of creation for anonymous works. Therefore, the photo was public domain in Russia at URAA date, so it is also public domain in the US. (I wish there was a template for this).
Comment
This image is cropped differently than what can bee seen in the book by Bolotin: the gun's muzzle and bipod are visible in the book, although the right shoulder of Tokarev Jr. is left out over there. This image is of higher quality than what I can obtain by scanning the small, half-column photo in that book. Perhaps someone can find a big & uncropped version somewhere.