Some more date from AF, which might be different from LH:
S1 - confirmed ticket on duty service, also sometimes a present. Zero cost. Taxes paid by the airline.
In case it was a present, could be in Eco, Biz and even First, but in this last case it was subjected to space available at time of boarding.
R1 - also known as ID50. Confirmed seat paying 50% of the lowest published fare.