Two Lionel Engineering Labs Mark IV sets. One is the Plastics Engineering Lab No. 3229 and the other is the Electronics Lab Mark IV No. 3203.   3203 appears to be complete or mostly complete with light wear to container.  3229 appears complete or near complete with many parts in factory sealed packages with light wear to container.  Please view the photos of the items in this lot carefully as they are being sold as they are shown in our photos with NO returns or refunds.