This is the Embossed Die-Cut Metal Sign - Boston & Maine from Microscale Inc.
Modelers and railfans alike can decorate their train rooms with high quality, affordable reproductions of railroad heralds. Manufactured in the U.S., these metal signs are die-cut so that the signs retain the shape of the original railroad logos. They are also embossed, giving the signs a slight 3-D effect. Each sign is produced in vivid, authentic and durable colors and are approximately 8 inches in height. They also feature a light weight and have pre-drilled holes for mounting.