In old 1910-1920 photos of courses you often see no flag on top of the flagstick -- metal flanges with the hole number were fairly common, and wicker baskets showed up in many different locales.
I've never seen the metal flanges at a course in my travels the past 40 years. Apart from the baskets at Merion, I've seen wind socks in Hawaii, and odd little pennants a time or two (including LA Country Club). The very short flagsticks at Secession also stand out as oddities.