This banal invoice tells us some useful facts.
- It confirms Établissement F. Charvin as the producer of the Le Lautaret derailleurs (see the text down the left hand side).
- It gives an address in St-Étienne for the business.
- It confirms that Charvin was was still in business in 1961. The reference to the Le Lautaret derailleur on the headed notepaper implies that it was being manufactured at or not too long before that date.