Interesting. I couldn't find anything additional in Scott. Do the two mystery stamps match the characteristics of Scott 1067: engraved, wmk. 267, perf. 11x11 1/2? The perforations are rougher on the mystery stamps. Forgeries, perhaps?
Yes, the engraving, watermarks and perfs are the same. Part of the reason the perfs look rougher in the photo is that a number of perf holes remain attached.
You can try sending the Scott catalog editor an email describing what you have, and offering to let him examine the mystery stamps. They may be unlisted varieties.
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