Value of a 1917 mercury head dime made at west point?

That would be pretty difficult, considering that the West Point Mint wasn't opened until 1988 and only ever struck dimes in 1996. You're looking at the monogram of the designer A. A. Weinmann. The mint mark, if there is one, is on the back near the Word ONE.

If your dime has no mint mark or an S, it's worth $2 to $5 in average condition (prices as of 06/2008)

1917 dimes with a D are scarcer and sell for $4 to $20