Although its provenance is not well documented, and therefore suspect, Fischer believes that the London tablet may be the youngest authentic inscription that has survived.
Métraux thought at first that the London tablet was a forgery, due to the engraving being of the poor quality seen in modern carvings for tourists.
The evidence is principally the paraphrasing rather than copying of text Gr, which would have required literacy in the script to accomplish.
He believes that it was carved "just before the cessation of rongorongo production in the 1860s", in the period of decline that followed the death of ꞌariki Ngaꞌara in circa 1859.
Fischer also believes it to be a list of some kind, and notes that the simplicity of the repeated glyph on this recent tablet, compared to 380.1+3 of G and 380.1+52 of N, suggests a compositional simplification over time.
The prototypical pictograph of a bird, glyph 600, which looks like a frigatebird on older rongorongo texts such as G, here has a different head, resembling in Fischer's opinion the sooty tern.
Fischer notes that the last Birdman competitions sought the egg of the sooty tern rather than the traditional frigatebird, which by then had been hunted out.