The buckle is a very early cast piece with hand cut detail. From what I can see, it looks to be brass or similar alloy. From the shape and size, I'll venture that is a Colonial knee britches buckle. That particular style from my experience, is around 1720's or there about. Some of those early brass alloys are exceptional metal, and can come out looking nearly as splendid as silver.
The smaller hatchet appears to be a "shingler", and should date late 18th century to early 19th century. The larger one appears to be a small axe of the Colonial era.
The "swagger stick" tip is in fact the top or tip to a fancy parasol. The parasol handle was formed of wood, and this tip was pinned to the top. I've personally dug that exact same tip, along with a portion of the wood and the notched brass parasol ring that the struts attached to. My example was found in context with relics of 1780-1840. Parasols can date to earlier Colonial times, yet I believe this type of well stamped design in rolled brass was not commonly seen until the Industrial Revolution was in full swing by the 1820's or later.
CC Hunter