Found this heavy pointed brass weight in my dad’s old toolbox. It has a string attached. What is this?

5. How Old Is It? Dating Your Dad’s Toolbox Find
Dating a vintage plumb bob can be a fascinating journey into the past. Many plumb bobs were produced in the late 19th to early 20th centuries, a time when such tools were in high demand due to rapid urban development. Manufacturer markings, such as logos or patent numbers, can provide clues about the era of production.
If your  plumb bob has any inscriptions or unique features, researching these can lead to identifying the period it was made. Consulting antique tool catalogs or online collector communities can also provide insights into its age and history.6. Common Trades and Projects That Relied on Plumb Bobs
Plumb bobs were essential tools for various trades, including masonry, carpentry, and surveying. Masons used them to ensure that stone and brick structures were perfectly vertical, preventing future structural issues. Carpenters relied on plumb bobs for installing walls, door frames, and cabinetry, where precision was crucial.