This is a scarce and desirable pair of van Dam FX56 uncancelled "BR" perfin (Babson's Report Incorporated) pair and is a Canada Federal Three Leaf Excise Revenue.  This perfin is sought after by collectors due to its scarcity.  It is an excellent addition to any stamp collection and a must-have for advanced collectors. With its historical significance, it is sure to add value and excitement to any collection.