This is a Haynes Publishing postcard (printed by Dexter) from the mid-60s.  When the photo was taken, this barrel-roofed building was over 40 years old; it was finished in 1940 as the Kingsport Civic Auditorium and Armory.  It was built under the Public Works Administration.  If the resolution of the image were better, I might be able to read more of the sign, but I think it’s for a wrestling match. I checked the Times-News archives, but couldn’t match anything up.

I wonder if all the armor, since it’s no longer an “armory, is now down at the library…