All,
Thank you for your responses, these have given me food for thought.
On reflection I agree with Dirk and Florian the theme is around rice planting. Florian's picture of the farmers in the paddy field certainly rings with the design on the front, with three farmers on the left and two on the right, with the small gold vertical inlays the actual rice plants (although not the normal uniform planting).
This may also account for the horizontal carvings in each quadrant on the front, representing the water in the paddy field. Similar on the back.
The pole and flags may well be a simple scare crow!
Your thoughts and insights are very much appreciated.