Antique Parade Breast Collar With Silver Plated Diamond Conchos-Decoration Only.  I believe they are silver plated pieces, but I am not an expert on that so use your own judgement.  All decoration pieces are there.  The buckles that would go to the strap across the top of the neck are broken or missing as pictured.  The straps that would hook to the saddle are complete but the leather is old.  Would make great barn decor, or possibly use the Diamond and Triangle pieces for replacements on other antique horse tack.