1700 Britannia Farthing - Pic and questions

Here is a picture of a Farthing dated 1700 that I picked up at a coin show a while back. I picked it up because MrsSpud has a collection of various modern Britannia coins and I thought am older one would fit in well. It isn't in the best of condition, but not overly bad for a coin that is as old as it is. The coin is in a 2X2 with the cryptic writings saying KM-483.1 and SI-SC-IYI. Does anybody know what this means? Also, does anyone have a picture of this type of coin in better condition. Thanks, in advance, for any replies and thanks for looking 


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Steve
Collector since 1976. On the CU forums here since 2001.