I don’t know much about these pencils at all – they belonged to an art teacher, who had evidently bought them in bulk.
They’re a nice size, (10mm or so across the flats) similar to the Rowney Black Beauty, which is one of my favourite art pencils. They come in the four colours depicted, red, blue, green and yellow, but all have the same “No. 227” imprint, suggesting that only the colour is different.
The short points seem to be the factory point (the red and green pencils are the only ones out of the whole batch with that useful long point).
The imprint reads “perma bonded lead PRIMEX by Cumberland England No. 227”.
I can’t find any information about them from any of the usual sources, however.