Hello Henry,
absolutely the 3969R is small and plain and not an orriginal design like the 5100. Just a typical tourneau watch case the 3969R. Seems that the Platinum and the Rose Gold 5100's seem to be the most popular with the White Gold and the very common yellow gold much less popular. The rose gold sells for as much or more than the white gold and the yellow gold being the least expensive and the platinum selling at a premium.