Your only hope of finding value in this plate 145 stamp is in the watermark. Rare to find inverted from this plate but worth a look. 130,800,000 were printed from plate 145.
Otherwise, taking into account the lack of scarcity and its condition, it is safe to say the stamp which cost one penny when printed between 1858 to 1869 has kept its value
Edit: maybe too flippant an answer in the second paragraph, The stamp is perfectly acceptable in a collection of plate numbers for these stamps. Plates start at plate 71 and go to 225 (excludes 77)