292/4 was I believe subject to imitation in antiquity (hence the greater number of specimens).
These three heavy-weight die-linked specimens I believe to be the product of the Roman mint. Notice the small neck and fine features, both common at the Roman mint at this time.
Here’s a selection of light weight crudely carved specimens without known die links:
I thank both Schaefer and McCabe for discussing 339/4 with me and thus getting me thinking about weights and imitations.