This is a rare vintage sterling silver capital building charm made by Walter Lampl. This charm was going to include a Stanhope and Walter Lampl had a patent drawing done of it. The charm is marked STERLING, Pat. 5-2-39, 114,541 and was filed on Aug. 16, 1938. The charm retains its original patina. This would make a nice addition to your collection of charms.
Thank you for looking!