This was the reply from the person that purchased this cob and he seems to have vast knowledge I also posted the questions that were asked and answered by the seller.
Question & Answer Answered On
Q: can I have an exact weight? this will help to prove authenticity, thanks Mar-01-08
A: Hello, like we stated previously, coin weighs 4 grams. Coin probably is a replica, that is why we clearly stated that we cannot guarantee it's authenticity....more
Q: how many grams? Feb-29-08
A: coin weighs 4 grams
Dear ron99ald,
Thank you very much for your concern. I went to the site and must confess that I was vastly amused by some of the comments. Certainly there are fakes sold on Ebay both knowingly and in honest ignorance but there are also professional cynics who, perhaps, having been burned once now see everything as fake until proven otherwise.
As to the weight they might consider the question of why we now have reeded edges to our coins. Surely they've heard of clipping precious metal coins. I'd be much more concerned if it was heavier than it should be (and that has been known to happen with fakes), and the Atocha reference means nothing; simply a seller's ploy to attract interest.
The coin is a typical example of a AV 2 escudo minted at the Virreinato del Peru in 1705; mintmaster H. The inscription and design are both correct.
If you can find an example you might wish to obtain a copy of El Gran Libro de la Onza: Cecas Peninsulares, Provincias Espanolas de America y Republicas Independientes, Resellos y Falsificaciones, 1611-1873 (Barcelona, 1986). While this book deals with the 8 escudos it contains a wealth of information that relates to the fractions as well.
All good wishes,
Ron