Datacomp, like Chicony, has a history of using different switches in the same keyboard design. They used a different model number or suffix to indicate that, but we don't have a model number on this one. There were other Datacomp 500-series keyboards that aren't in the wiki, so there is a chance of that one having Alps switches. But physically the only documented match is the DFK-501F.
edit: changed DFK-501 to DFK-501F. Searching for a DFK-501A or DFK-502A, the likely model numbers for Alps versions, gives no matches. Later Datacomps used a different model number with no switch suffix, like DFK-121/DFK-191 for Futaba/Alps.