Where on a double Ithaca is the grade mark?

On a double Ithaca shotgun, the grade mark is typically found on the underside of the receiver or frame. It may be stamped or engraved, indicating the grade level of the gun, which reflects its quality, craftsmanship, and features. Additionally, some models may have the grade designation on the barrel or the tang of the stock. Always refer to the specific model's documentation for precise details.