A room appropriated to the same purpose as a counting-house.(noun)
The Century Dictionary (Public Domain)
Use "counting-room" in a sentence
"He led me through the counting-room, to an apartment up a flight of stairs; before ascending, however, he looked into the book in which the foreign-visaged clerk was writing, and, seemingly not satisfied with the manner in which he was executing his task, he gave him two or three cuffs, telling him at the same time that he deserved crucifixion."
"I entered a counting-room, in which a solitary clerk, with a foreign look, was writing."
"With a quick step I entered the counting-room, where, notwithstanding the earliness of the hour, I found the clerk, busied as usual at his desk."