For international letters.
To wean the Native Americans from their tribal way of life.
Letter scales are used (especially in a Post Office) to find the weight of a letter or package. The weight and size of a letter or parcel is used to ensure the correct postage is paid.
An office is generally a room or other area in which people work. The purpose of the office is to furnish essential services to the management, customers or clients
Bureau of Indian Affairs
Peon
Indian bank
1824
red
The Bureau of Indian Affairs originally called the Office of Indian Affairs.
An office Building
to write
It shows that a person has acknowledged that they have actually seen the letter on its arrival at its intended destination - and what date it arrived on. Both aoutgoing and incomming office mail is usually listed in a log. That way, there is a physical record of all sent and received mail.