Wayne,
are you absolutely sure that the lines are India Ink and not 'Blueprint'/Dyeline/Diazo?
I ask because the implication could be that, if they are Ink, then they have to be 'hand-drawn' and THAT makes this object 'an original', whereas, if they are Blueprint then the object is a 'copy', albeit one of value.
Blueprints can be made on linen as well as on paper, so the substrate is not an issue.
'#3' suggests either a copy number or perhaps an iteration. The hand-written extras are intiguing to say the least...
FBD.