Some people know Gerry Treadway as a teacher who imparted woodworking skills at Unionville High School for 35 years.
Others know him as the character who dresses up as Uncle Sam and marches in parades on patriotic holidays.
Still others know him as the unofficial historian and one-man historical society of Parkesburg, a quiet village in western Chester County.
But to folks who are passionate about old bottles, especially those with local ties, Treadway is the dean of this peculiar pastime and an astute collector whose authority is based on decades of diligent research.
Treadway's focus is bottles with a Parkesburg connection. Over the last half-century, he has collected more than 150 pieces - malt-liquor bottles, milk bottles, apothecary bottles, whiskey bottles - all bearing the name Parkesburg, either embossed or printed on labels. The collection ranges from bottles made as long ago as 1852 to plastic prescription containers from the nearby Wal-Mart Supercenter.