Thrift Store Find - Keiser 8-Day 7 Jewel Mechanical Clock

Here is an interesting clock that I recently found at a local thrift store.  It's a German-made mechanical clock.  It currently shows the time correctly twice per day.  It's a potentially interesting project and a bit of a dilemma.  I'd like to get it working again.  However, there are no extra funds for a serious professional repair.  Yet, an amateur repair has a good chance of simply making a mess.  Putting a quartz movement on the back and calling it a day is a possibility, but would destroy any "collector value."

The clock is about 5-inches in diameter with gold tone hands and markings.  The background of the dial is a simple grid.
 

Kaiser 8 Day Clock

I took the cover off of the movement to reveal the complex 7 Jewel movement underneath.  I stopped at this point because I would require a smaller screwdrivers, some sort of cleaner for the parts, a parts container, and most importantly a clue about how to put it back together again!

Kaiser 8 Day 7 Jewel Clock Movement

 The movement appears to be a two-deck affair with lots of gears and small pieces.

Kaiser 8 Day 7 Jewel Clock Movement (Side view)

Since it is a wind up clock, there is also a spring to worry about.  I believe it is contained in the drum shown below.  Any tension on the spring would need to be released carefully.
 

Kaiser 8 Day 7 Jewel Clock Movement

 This gear assembly looks really cool.  It would be fun to actually see it in motion!  The question is how and when . . .
 

Kaiser 8 Day 7 Jewel Clock Movement

One thing that I noticed is that some parts are missing.  There is a fixed winding key screwed into the back that winds the alarm bell.  However, there was no winding key for the movement itself.  It seems possible that the clock might work if it were simply wound.  Ah well, I may actually have to read up on this topic.