So, no portion of the "19" got inked, but the cirle around the outside of the stamp did? And, exactly how would not getting ink on a critical portion of the stamp explain the fact that the "80" is out of alignment with 4 other samples of the same stamp, from the same post office?
2. Yes the 80 appears slightly out of position, but this is a hand loaded stamper and
Because, the "19xx" stamps have been destroyed, like 20yrs ago. So, the forger grabbed what 'was' available in that year - a "2008" stamp (does that year ring 'any' bells?). He cut the stamp in half (and this was his screw up); turned the "08" upside down, and viola you have "80". Then, he hand-positioned the half-size rubber stamp improperly - messing the offsets that the 'real' "1980" stamp would have had, and providing us with evidence of fraud.
And yes, hand stamps suck and don’t ink properly all the time. Very common.