This is Henckel Supply Co at 8219 Wallace Rd and it's behind the old Sigmor gas station, which later became Sinclair and is now called Road Way at 8227 Highway 6 in Hitchcock, Texas, 77563. I washed my truck at the carwash to the left of Sigmor many times but this is earlier than when I moved there in 1970. I'll need to do some research on this one.