Link to the Ranfft archive showing the 6106 movement.
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Seiko_6106A
Information? The Ranfft listing may give you some answers. If there is information that you need after perusing the link, get back to us and ask specific questions.
Calendar problems. Many Seiko movements use plastic parts in their calendar mechanisms. You may need the help of a repair technician to diagnose and solve those problems.
This watch was made October of 1970.
Very easy to figure out these.
http://www.watchsleuth.com/seikodatefinder/?mvmt=6106&case=8420&serial=003697
Some data on the watch
http://www.watchsleuth.com/seiko5finder/search/?MOD=6106-8420
If I remember correctly the large number of jewels adds them as bearings on the date disk. Unneeded just to increase the jewel count.