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.
I don't usually tip a percentage for things like delivery because it's a one time service. The reason I tip 5$ is because a delivery guy usually makes 3 or 4 deliveries an hour, and I think 15-20$ an hour is a good wage for the job, assuming he gets a couple bucks per delivery from the restaurant as well.