O-SD stands for Old (or Original, if you prefer) Super Deformed. It is based on first SD kits released by Bandai (G-generation Zero / G-generation F). They are shorter, more stubby and usually without legs.
Automatic support is needed; the model is simple and easy to build with plenty of detail carved in. A bit of sanding is required for a more polished result, after some paint I´m sure it will blend well in your gunpla collection.
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