A formal link exchange generally refers to an internet based system that is set up to facilitate these sorts of link exchange. There are some well known link exchange systems on the web that are easily found via a web search.

The centered, decoupaged Madonna is surrounded by distressed and burnished gold in this vintage, wooden, Italian plaque. It is 4-3/4" x 4-3/4" and in very good condition. I find just a few, very minor, nicks on the wall edge where the white gesso shows. The back is stamped, Made in Italy with the number 36 underneath.