One of your camp members, Lenny, will ask you to find a pocket watch, but the problem is that there is only one such watch on the entire RDR 2 map. Below you can find a map with their exact location.
Pocket watch location
Travel to the western part of the map, into a large valley. Now head towards the "W" in the word "West" and then drive northeast where you will find Echo Vetter's lonely hut.
If you have not been here before, then be careful, as there is a large bear inside the house. However, if you killed him before then he will no longer disturb you.
Having dealt with the bear, go to the table with a typewriter - there is a pocket watch on it. Now go back to the camp, find Lenny and give them to him. In return, you will receive some money, as well as honor points.