Hi ,
Looks like the real thing to me :hiclp: , c 1750 ish, copies are made and are pretty abundant though are always very bright in the metal and slightly off form ,thems too thick etc , although untill seen in the hand I could not be 110% sure so I am afraid 99% is all I can give at the moment, to assemble a matching set would be pretty difficult as this form is made in a multitude of sizes though surviving origional sets do exist and can sometimes be purchased , the one you link to is of the same basic form as your 2 but probably not a very good match if trying to make a set , and the price is a high retail price, in the UK you could expect to pay around £100/150 (eBay, local auctios etc) for this type of glass , though larger sizes may cost more.(see my exhibition catalogue in the refference section for some large ones )
If you need any more info or would like me to look at some more photos ,contact can be made via email on the left.
Congrats on a good find , :thup:
Peter.