Meanings of small blackboard in English

For the first time Don noticed a small blackboard nailed against the wall:

Only weekenders tried to order from the small blackboard that listed the cafe's daily specials.

I'd got a small blackboard in Boulogne, and they all had notebooks, and the Q.M.S.

Walsh comes in carrying a series of wet photos stuck with clothes pins onto a small blackboard.

They were headed by Phyllis Smith and Dorrie Barnes carrying between them a small blackboard upon which was chalked:

Having obtained her high-school diploma as an adult, studying every day after work, Ousmane gives her children extra lessons at home using a small blackboard.

Fish Hot Pot has a small blackboard on the footpath with Chinese characters and €15.99 per person written underneath.