Not sure, haven't had time to run it down with a couple French butchers friends on Face book yet, But I think it's circa 1900. The bulls head at the top, which was typical of butcher blocks of that era.
One of our French member, Véronique Langlais who is from a long family of meat cutters, her husband is a butcher, her father, grand father and her brother. Has talk with her father about this block, he puts it at around 1920