These are early pinfire cartridges made by Gévelot for the Lefaucheux 1854 revolver. They are probably one of the earliest metal-cased pinfire pistol cartridges as well.
They used his compressed lead method and had a “G” stamped into the tip of the bullet to indicate it.
Not typically. Sometime they have pictures of awards they have won which allows you to date it AFTER a certain date. And trademarks sometimes allow you to date them.
I have this enclosure in my collection, 12mm and same enclosure pattern.
Can Iassume they are for the same cartridge? Made by Gévelot for the Lefaucheux 1854 revolver.