I bought two continuous milling silver proof Barcelona dollars (in the long box) at the Sydney Coin Fair in 1992. I gave one of these to my sister, who is an active collector, the other I gave to my mother, who was also an active colletor of RAM products for about 12 years. I now have her collection.
She collected all of the known versions of the Barcelona dollar. Mc Donald lists them all.
The Royal Australian Mint (RAM) sold them for $35 each on the day. 2500 of the continuous milled long box version of the Barcelona dollar were produced.
These coins were valued in the catalogues at $350 a few years later, which I think were overpriced at that time. I have not really kept track of their value since then.