Aside from the 800 and Crescent/Crown, I see the capital letter R followed by what is either a six-spoke wheel, a six-petalled flower, or a "mogen dovid" (Jewish star-of-David) in a circle.
The flatware dates from the early 1920's, I believe, and was fairly new and "up-to-date" at the time. The original purchaser lived in Mainz am Rhein, and was a Jewish business owner living near the St. Emeran's Church, not far from the Marketplace and the Mainzer Dom. (The emblem of the city of Mainz is a cartwheel, about which there is some pretty legend, but which, I understand, is now thought to date back to the pre-Roman inhabitants who worshipped a sun-god called MOGO--and the "Mainzer Rad" or Mainz wheel is supposed to be HIS emblem, a stylized solar disk...in case you're interested.) I do not know if the silversmith was a Mainz artisan, and Mainz is situated quite close to several other large cities, including Frankfurt.
Here are two 1200 dpi grayscale scans of the hallmark:
And a 150 dpi scan of the luncheon-fork and soup-spoon are located here, if you would like to try to name the pattern for me:http://www.concentric.net/~rsk/Ag/silver_small.jpg
I'd be very grateful for an identification and any information about this pattern that you can provide.
Thank you kindly for your attention--as a total naive about silver, I'm delighted to find this Web site and this forum, and hope I shall soon find an answer or a direction for my search.