The first post card of Labuan was issued in 1881. This was the 4c green on buff card. It bears the head of Queen Victoria similar in design with the concurrent stamp issue.
In 1891, the card was overprinted 3 CENTS when Labuan joined the Universal Postal Union on 1 July 1891 and the overseas rate was reduced to 3c. According to Higgins & Gage, both genuine used and unused copies are rare and counterfeits exist. However, the latter's existence has not been proven and almost certainly no forged copies have been seen or classified as such. So what we have here is quite likely to be the real deal. Commercially used copies are definitely going to be expensive.