National Register of Historic Places 6"w x 5"h Cast Aluminum plaque with the standard set-up is a  1/4" thick casting with your choice of hidden mounting hardware  for masonry, brick or concrete or screws through the front for mounting on on a variety of surfaces.  Each plaque includes a mounting template, as well as a digital proof for approval prior to production and  a digital  picture of the finished plaque prior to shipping. Production time is usually 2 to 3 weeks after the date of final approval.  
Standard Set-up: This Property Has Been Placed On The National Register Of Historic Places By The United States Department Of The Interiors

Nat'l Reg. of Historic Places - Alum. 6"w x 5"h