I'm trying to post a pic, but it says the file is too large...
I think that 'spike' is a nail file.
Price is always a hard thing to judge, it can vary quite a bit. This similar knife (Phillips instead of cork screw) went for close to $50 just a few days ago: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230416488982 Yours is likely older because it has the bail.