What do we have here?
Something that I found late last year that frankly has puzzled me. This is a close up, backlit and enhanced by contrast/brightness, of the letter 'T' from the Tamam Shud torn piece. Look carefully within the highlighted area and you'll see a short string of numbers in a block type format it is admittedly quite feint but the numbers are there.
I made some enquiries from a long time friend who is a printer, I asked him whether it was common to include serial numbers on a letterpress font. The short answer was 'No' and decidedly 'No' on the print face.
So, what do we have here?
Once again you should ensure that you have your screen resolution set to the optimum high res.