Ron Guth:
The 1877-CC Dime has the second largest mintage of any date in this denomination (only the 1876-CC Dime has a larger mintage). However, the popularity of this western Mint means that a premium price is always charged for this date. Literally hundreds of examples 1877-CC Dimes exist in Mint State, so collectors will have no problem finding a nice one to add to their holdings. It is only in MS67 that the 1877-CC Dime becomes rare.
Most examples are frosty and lustrous, but a few examples are Prooflike.
This date comes with either a Type I or a Type II reverse. Dime expert, Gerry Fortin, has identified ten die varieties among the Type 1 reverses and 22 die varieties among the Type II reverses.