The KINGDOM OF BAVARIA (German: KÖNIGREICH BAYERN) was a German state that succeeded the former Electorate of BAVARIA in 1806 and continued to exist until 1918
This set contain 14 post stamps:
Some of the stamps appear to be never hinged but I can't be 100% sure. Others in the set show signs of having been hinge-mounted in the past, have full original undisturbed gum with no trace of damage.
Would be an awesome collectible regardless.