Mace Electronics had a retail 'super store' at 2631 West 8th Street in Erie, PA. The store had its grand opening on September 19, 1968. This postcard was mailed June 16, 1977 to let a customer know that their cassette recorder had been repaired and they could pick it up at their earliest convenience. I'm not sure when this photo was taken, but you'll probably recognize some of the old cars parked out front. The Colony Plaza sign is visible in the reflection in the window above the red car.
Here is an article about the Grand Opening Sale: http://oldtimeerie.blogspot.com/2012/08/mace-electronics-grand-opening-w-8th-st.html
Enjoy more historic facts and photos of Erie, PA at: oldtimeerie.blogspot.com