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In relation to jewellery - it's the purity of the gold (14k) the 'ar' mark probably identifies the manufacturer.
The stamp "172 AR" on a gold chain likely indicates the gold's purity. In this case, "172" may refer to the gold's karat weight, with 172 karat gold being a very high purity level. The "AR" could be a maker's mark or a hallmark indicating the origin or manufacturer of the chain. It is important to note that the specific meaning of these stamps can vary depending on the country or region in which the chain was made.
160 * 160 = 25,600
320