You've got an Ames "Peace Flask", so named because of the clasped hands on it's face. The top has the correct date and Ames mark. These flasks were originally developed to issue out to riflemen and were part of a set later given the designation. M.1841 to match the M.1841 rifle developed to arm them as well as issued out to the Regiment Of Mounted Riflemen for whom the Walker Colt was developed, not the Texas Regiment of Mounted Rilfes, Walker's origins from there to the contrary. At the Time Sam Walker was an officer in the Federal regiment and the design was for them...never mind 180 got into the hands of the Texans and many goody legends immediately cranked up. The mounted troopers used a different set up than the infantry using this flask on a woven cord and a smaller cartridge on the back of their belts. This flask continued on for a long time in military and civilian service.
New copies began to be remade in the early 1960's to be used with the then new Zouave copies being imported here from Italy. Because of it's shiny patch box and other brass ornamentation, the replicas of the M.1863 Remington got the name "Zouave" though it was, ironically, the M.1841 rifle also called "Mississippi", was the rifle favored by Zouave units then. The replicas bacame known as "Zouave" flasks because of this mix ups.
Your nice original is dated 1839, which makes it an early one. Congratulations, good shooting!
