The obverse legend, like other French coins, gives the kingâs title as Francorum Rex ( King of the Franks  in Latin) and provides another reason to call the coin a franc. Its value was set as one livre tournois (a money of account).
Favor has a no-tipping policy from company to restauraunt, so those waitstaff that take your order pay out the kitchen (they have to pay out a certain percentage of their total sales) for you to not tip. They pay the kitchen to make these orders and make no money, unless you tip out of pocket.
Although the job is done, so the toke has no effect on the service, tipping on delivery is standard guest procedure (no different than tipping a waitperson when paying the bill). On the other hand, there's also a school of thought that holds you should tip the valet when you're dropping off your car.