Painting by Diego Rivera

A small closeup showing most of the painting:
A larger photo of the painting:

Factual Description:

It is an oil on canvas painting measuring 46cm by 54cm (inner frame), signed by D. Rivera.

It is a portrait of a man with a reddish beard and recessed hair line.

The man in the painting wears a heavy grey uniform, with the number "122" showing in three places.  The uniform has big buttons on the collar, and a red dot associated with each of the "122"s.

The man in the portrait wears a dark hat, with no shade or brim.

The background is mostly dark.

The painting, which has no visible date or title, was acquired before 1935, and is in its original frame.

Diego Rivera's signature in the top right corner of the painting

Some Questions:

When and where was the portrait painted?
Who is the portrait of?
What situation does the nice uniform with the "122"s imply?
Why is the hat so unusual?
What is the history of the painting?
Diego Rivera, 1949
Diego Rivera Murals and Paintings here...