Brill write on their facebook page-
Happy birthday, John Calvin! This doodle of the French reformer was made by one of his students, thought to have been Jacques Bourgoin. It adorns the cover of Jon Balserak’s book “Establishing the Remnant Church in France: Calvin’s Lectures on the Minor Prophets, 1556-1559.” www.brill.com/establishing-remnant-church-france
That is one fantastic book!