Forgi,
You say you are new to watchmaking so I'm guessing you're looking for any info about the 48320 movement; disassembly instructions, parts schedule, lubrication chart etc. ?
Orient has not used the 48 caliber in any current models.
I've looked at two caliber lists and I do not see the 48320 listed, however I do see the 46320 caliber, used in 1973 HighAce models, hand wind, 17 jewels.
Your best source for info is the Orient service department in Japan, but, you will likely need to be persistent to get any information.
Good luck w/ your search.