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What do the numbers 12/18 or 18/3/1 mean?

Often. but not always the numbers that precede a style of chain will relate to the size of the chain. Example:
 
12/18 Trace - 12 = gauge of the wire in thou (0.012") /18 = links per inch
 
18/3/1 Figaro- 18 = gauge of the wire in thou (0.018") / 3  = small links per inch / 1  = large links per inch
 
28/6/6 Z Curb -28 = gauge of the wire in thou (0.028") / 6  = links per inch / 6  = double link