I don't know if it is any help or not, but I found images of these stamps on the internet, which looks quite similar to the ones posted earlier, so my guess is they are from the same company:

These examples are also unidentified but were reportedly included in a stamp lot from New Zealand, so it is fair to assume they probably originated either in New Zealand or possibly Australia.
In both cases, they make reference to 0.125 p, which further supports the idea that they are from one of those countries.