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A Aluminum R Rope Chain
B Brass R Filed Round
C Curb RD Drawn Rope Chain
D Drawn S Steel
DF Drawn and Flattened W Wide
F Flattened X Unsoldered
F/ Filed 2 Sides /100 Diamond Cut 1 Side
F/4 Filed 4 Sides /200 Diamond Cut 2 Sides
F/5 Filed Swedge 1 Side /250 Diamond Cut Groove Edge
F/6 Filed Swage 2 Sides /400 Diamond Cut 4 Sides
F/Prec Precision Filed on 4 Sides /500 Diamond Cut Pentagon
F/R Filed rounded /600 Diamond Cut Bevel
H Heavy Filed / "number" Diamond Chain
K Knurled    
O Filed Oval