In 1937, this is what the crossroads in Exton looked like:
Mostly farm fields and woods. Here’s the same photo zoomed in on the crossroads of Routes 100 and 30 (the Lincoln Highway).
Next I overlayed the same shot with a shot from 1971.
The Exton Square Mall had not yet been developed but the Exton Drive-In is there (can you find it?). Plenty of housing and commercial development are starting to show their marks on the West Whiteland landscape.
The photo below is a shot of The Guernsey Cow around 1974 or 75 after The Exton Square Mall was put in and the K-Mart and Exton Cinema were under construction. My grandfather had this in his office and my older brother has it on display in his home now.
A close-up below shows The Cow property, Sleepy Hollow Hall (aka The Massey House) and The Guernsey Cow sign across Lancaster Highway.
And another overlay below using Google Maps shows the level of development in the crossroads today 30 years later.
The Guernsey Cow property below as it is today as the DNBFirst bank.