UPDATE: This looks to have been an MPC model, as MPC created a variety of jeep-related models. One particular kit by MPC allowed for the creation of three different kinds of jeep: ! Hill Climbing Dune Buggy Jeep, A Stock Jeep, or a Service Station Jeep. Here’s an example of that model on eBay.
Here’s a better example of the service station CJ-5 model from Barney Goodwin:
And here is a 16 minute video on the history of the AMT model company (and explains how MPC formed). I found it interesting (no mention of jeeps):
Here’s another CJ-5 Service Station model that is labeled an MPC:
https://skidsplace.forumotion.com/t3457-mpc-jeep-cj5
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This model sold on eBay yesterday for $25. What I found interesting was the level of detail, from the Dauntless engine mounts, to the Canfield Push-Plate on the front, to the Meyer half-cab details.