I don't see articles in the papers of the day talking about the citizens of the UK, Switzerland, Germany, etc.....engaging in the hoarding of gold and gold coins to the extent that the French did. Clearly, a cultural thing.
Europe overall much more into gold coins than here in the States. French farmers, middle class, and professional class (doctors, lawyers, small businessmen) leading the charge.
Not sure why...could go back to Napoleon. No history of devestating wars that I am aware of or hyperinflations in the 1800's. WWI did have an impact on the accumulation tendencies of the 1920's and 1930's but not sure about the herd instinct before then.