OOC's second Hong Kong bus casting was based on the Alexander ALX 500 series, the model comes in three versions, 443 has the central entrance near the front axle while 444 has the entrance further back, a change introduced on the real vehicles for safety reasons. A third version OM458 represents the small batch of coach seated vehicles operated by Citybus.

The vast majority of the releases have been commissioned by Hong Kong operators themselves, and most of these have initially been released in Hong Kong with UK releases of some following sometime afterwards mostly via Corgi Gold Star stockist's.

More comprehensive details of all the Oriental OOC models can be found at Oriental Model Buses along with a larger selection of pictures.