In the 19th and 20 th century a popular thing for your desk would be a postal scale, after dealing with your correspondence you could pop your mail onto these small scale to establish the weight, and then place the appropriate stamps on the letter, this way when a member of staff took the mail to the postoffice there would be no need to carry money.
 
This is a folding postal scale with a removable tray for transporting.
 
Condition is very good.
 
Dimensions; 17cm high x 13 cm wide.