Generally 1930 British trade dollars has quite a number of coins in high grades.
Hence the price is also relatively lower compared to other scarcer years.
Nevertheless, the truly high grade 1930B which is graded to MS65.
The price can be double of that of MS64.
This MS65 coin, was sold for USD 990 in ebay buy it now.
There is 11 coins graded PCGS MS65 from the census
Unfortunately the seller did not put a nice picture for the coin.
Please click this link to go to PCGS cert verification site to look at the proper picture.
Enter "17235487" to look up for this coin.