We have an Advertisement Post Card Gas appliance store Vintage item.  It measures about 5 1/2" x 3 1/4".    It was put out by Boston Consolidated Gas Comany (Ma).  It reads "You're cordially invited......to visit our smart new store at 25 Walden Street, Concord, (opposite Post Office), where you will see the newest gas appliances for the enjoyment of more convenience and more leisure in your home.  Pay your bills also at this new and modern location.  We are looking forward to your visit."......  There is a preprinted 1 cent stamp on the front.  These (on initial posting I have a few) have not been sent/addressed, they are nos.

Advertisement Post Card Gas appliance store Vintage