Would Kadriorg (Katharinenthal, Yekaterinenthal) Castle be the site Nicholas II celebrated with the 19th Dvinsk Regiment (stationed in Reval--now Tallinn, Estonia) during the regiment's Centennial celebration in 1905? Once I finally work out how to post pictures (evincing my age, here) I'll post pictures of the ceremonial silver items. Elsewhere on this site, someone has been kind enough to post a picture of the ceremony in Reval.
Kiwi