Well, I sincerely hope I am wrong, but they look very similar to those which were sold in the British Heart Foundation Charity shops, new stock, a few years ago, which came in a few different colours and Flint too, and which are often on ebay as Whitefriars. The BHF ones were quite nice quality and did have a shallow ground pontil mark if I remember correctly.
It's just an opinion, but odd to find three the same in one go.