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CWG Collection is website for catalogization of your xWG collection. It is connected to the official catalogue and due to automatic synchronization it always contains up to date information about all the coins.
You can note various information about your collection (year, number of pieces, comment) and also any other information in the form of tags.
You can offer xWG for exchange and easily have overview of your offered pieces such as offers from other users.
Because of available API, it is possible to access the collection from another applications.