Originally Posted By: MacManiac
...Mine has NO build associated with the Mac OS X 10.13.1 listed under "About This Mac" under the Apple Menu.....


In the "About" window, click on the version number; you'll then see the Build added.

Additionally, you could also use the Sys Info app (Utilities), click on Software. You'll also see the System Version with the Build.

MacStudio M1max - 14.4.1, 64 GB Ram, 4TB SSD; Studio Display; iPhone 13mini; Watch 9; iPadPro (M2) 11" WiFi