The Hoover Boys are a Metal Detecting Group on YouTube.   The Front of the shirt reads:   "Life, Liberty and the Pursuit of Happiness 1776"  A well known phrase written by Thomas Jefferson on the Declaration Of Independence in 1776.   The Back is The Hoover Boys Logo:  The colors are from their home State Maryland Flag and favorite phrases "Never Hunted Out" and "Dig It All." "1729" represents the date that Baltimore was founded. "1788" represents when Maryland was accepted into the Union to became a State.