There a 5 lines, counting up from the lower frame, till it meets the vertical shaded area under "2"
In your assumed added line, this is just a lighter impression, perhaps from plate wear.
I've yet to see anything that impresses me as a "double transfer" on
any of these, possibly wishful thinking.
"Re cuts" maybe.
I get these often in random auction lots, I was not aware there is a silk paper, how do I identify those please?