This is the same Larry Wood-designed Porsche 924 casting.
Model 4339-e corresponds to its 1983 release in the "Extras" series, which came with Blackwall (BW) wheels.
The "Extras" series was a short-lived mainline segment that featured more detailed tampo graphics than standard cars. This version of the Upfront 924 typically came in white with more intricate, multi-colored racing graphics.
This is a specific release variation of the Upfront 924, distinguished by its more complex paint scheme as part of the "Extras" series.
The "Extras" release is a key variation from the standard mainline releases of the same casting.