I'm having trouble determining which scott catalog number an early 1920's German stamp is (Iron Workers Stamp from 1921 or 22). The catalog indicates that 144 is perf 14 with Lozenge watermark. 168 is supposed to be 14x14.5 with the fishnet or network watermark.
What I have is definitely the fishnet watermark, but seems to be just perf 14 on all sides.
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