Half Dimes

I am a newbie in collecting and came across some half dimes for about $40 a piece I don't remember the dates and they were kind of dark coins. I have never seen a half dime before and was wondering if they would be a good buy. I usually just buy what catches my eye but I am thinking these may be an investment for later down the road when I need $$ for some coins I really like. Any suggestions would be appreciated. Thank you

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Comments
I would read up on the series in the Red Book and try to familiarize yourself on the series first.
If you cannot remember the dates of these half dimes, can you recall the designs or types? Did they have a representation of the Bust (head) of Miss Liberty in one form or another, or was there an image of a seated Miss Liberty? Was there an eagle on the reverse, or simply the denomination? Any additional information that you might recall would be most helpful.