A "semantron" (a flat piece of wood struck by a wooden hammer) is carried around the monastery as a call for a holy service. This was recorded at iviron monastery, mount athos, n. Greece.
Recording contains a single bell sound and the well known two-note "ding-dong" that is often used as doorbell. Recorded at the funkhaus studio, berlin.
The most uniqe door-bell i ever found. Made of 3 differet bells. The sound captures opening and closing the gate door which triggers 3 different bells. Probably it won't fit for your purpose but if so let me know in comment section:).