For the first question, shaft and double shaft is referring to the part of the wagon used to harness the horses to the wagon. The actual wagon terminology is Singletree and doubletree hitch. In coin terms, the terms refer to two varieties of the coin. The Coat of arms on the Reverse of the coin features a wagon located below the anchor. If that part of the wagon hitch looks like a "T" it is a single shaft, If it looks like an "H" it's a double shaft.

And I wouldn't try to polish or clean the coin as it reduces the value of the coin.

Regards KLR

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