It has historically been assumed to have been taken from a Transfer used by Paterson or perhaps a master stone from Paterson. The white head flaw has always been a problem for collectors to identify, as it is not equally clear or even present on all positions. Also they cannot be plated as Hoyer or Paterson. They are almost always in a light gray blue with a poor quality of printing. With Hoyer and also perhaps a slightly lesser extent with Paterson we have some beautifully printed stamps in most attractive colors and fine impressions.
Used multiples are much scarcer and are usually in poorer condition.
A strip of 4 is also reported but not confirmed. There is one well known used Stone Y block of 6 that was originally a block of 7. Now for the shocker, and I state this with considerable reservations as it should not be so, based on the large number of used singles. However I have no other record of this block. It is possible that the listed block of 10 is in reality the block of 15.