Can someone tell me what this could be? At the first look, it appears like a total bogus but the cover seems genuinely old. Moreover, if its fabricated, it would at least try to imitate something, wouldn't it? But instead, it ignores all common sense of the postal service. "IPP KAL"? IXA? I thought it might be a private courier service. It has no street address, just "Consul Mr..." in Tallinn. On the back there is a date 1921 january, did Central Lithuania have regular postal services between other Baltic states at the time? I would appreciate if anyone has any kind of information.
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