Searoad Side Door

Shot this Searoad side door SSDU box the other day.  

The road number is 217102-9, which probably identifies the size '2' as 20ft and the '17' as the year built.  '102' would be the serial number which may have started at either 000 or 100.

The container type being 5EGD is a bit strange, as 5 isn't a registered length, and probably should be 2 for 20ft foot length.  

Enjoy!