A Coptic Papyrus Letter(?) for Sale Online

Artemission, an antiquities company based out of the UK, is selling a little Coptic papyrus fragment on their website for $1,400. The website claims "2nd-3rd century" for the dating of this papyrus, although that is certainly not correct, as it is much later. It would appear to be a private letter, written on the verso, in which a certain "John the camel-driver" makes an appearance in line 5. The terms πρεσβεία ("intercession") and ἀγάπη ("love") also appear. The address is in the first line(s). 

Source: http://www.artemission.com/ViewItemDetails.aspx?ItemNumber=26.32381

Source: http://www.artemission.com/ViewItemDetails.aspx?ItemNumber=26.32381

As for the provenance, the website simply states "ex. Private UK collection, London, UK, acquired in the 1990’s." Artemission is selling another Coptic papyrus on their site, but I think I've included that somewhere on this blog before, or at the very least, I have already seen it. The provenance listed for that one is "ex. property Mr. M. N, London, UK, acquired in the 1990s," which is most probably a reference to Maurice Nahman, a famous antiquities dealer during the early twentieth century. It would be interesting to know just how many papyri were sold from Nahman's estate and where they are precisely.