:Dear BeneaIt did occur to me as I changed the launch date that there might be another source, and that I might not be the first to spot the difference; then I dismissed any idea of Rif being incorrect as mere folly.  Now that you mention it, it is just possible, especially since Davis has 1866 as well.  Your assessment of the time to build the other four ships is pretty convincing.  As you suggest, I will ask Rif.  Thanks for the heads up.  Yours,