I've been collecting for some years, but still haven't touched the tip of the iceberg so I figured I'd ask. I understand most of the biggest round signs were used on refineries, interstates, and large bulk dealers so they're a lot less common than your typical 4-6's. My question is this, just how big did these things get? The largest I've come across is an 8' round so I figured I'd see what some of the veterans have come across in their travels.

Always looking for rusty old pumps and signage especially Visibles, Northwest or West Coast brands, and Standard Oil of California.