Scott 2025 suggests that stamps in this set have a higher value if "Postally used". The brown stamp has a postmark. I imagine that is postally used. What say the experts?
Not an expert, but the brown stamp looks more like a CTO than postally used. Scott also mention counterfeits. Again, not an expert, but I would say that yours are legit. The green stamp looks suspicious but probably because of the overinking.
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