I believe what you have here is an 18thc bohemian goblet around mid century , the fact that the foot is not folded is not really a problem , many continental and english glasses of this period could be either plain conical or folded , the rim looks to me to be fire polished , as i would expect it to be, I have several examples in my collection.Hudson Moore's book (which i have) is considered by most to be very innacurate with its attributions , with many items being attributed to Stiegel and San Ildefonso incorrectly, these items probably having been imported by Stiegel and resold, old glass books can be very misleading!!!!,
The 'Rijksmuseum' catalogues show many examples like yours attributed to Bohemia and germany, you may also like to look at Dr Fischers auctions ,in germany, again here you should find many similer examples ,
So in a nutshell , probably mid 18thc and not a copy and not Spanish , probably Bohemian with typical Bohemian engraving of the period , and if bought cheaply a great find , though never highly valuable at auction , a few hundred pounds would be reasonable to expect.
Hope this helps ,