Does anyone know what is the Scott Cat. plate number with a vertical line as seen in this photograph? Personally, I have only seen without line with plate numbers, so I am not sure if this is uncommon with this specific block of 4. I read there were only 8 plate numbers sent to press. There is no information about a line pair in Scott's. Only sub category states for missing red cross under cat. for 706.
Any information would be appreciated. Thank you in advance.