1. Experience. 2. Michel Specialized does not list any imperforates for this stamp.
Also, the paper looks greased-soaked, and there's no postal stationery with this stamp design; if there was, the cutout would probably be "imperforate."
In any case, no expertizer, anywhere, for any reason, would certify a single stamp "imperforate" that has such tiny margins.
Ringstempel #57 is Heidelberg, probably the most common of all Baden cancellations.
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