This is Amusing Hobby's French AMX-50B. It's based on the fifth prototype located at the museum at Saumur. It has a 120mm gun and a cast lower hull referred to as "surbaissé" (lowered) that was used to save weight. Only five prototypes were built in the late 40s and early '50s, and the project was eventually canceled. As a rule, I really enjoy Amusing Hobby kits. This kit was no exception. It's a very unique subject and a straightforward, enjoyable build.