I located the last remaining SC150/649 OP subject scratch for this sheet
and I'm pretty confident this completes the horizontal layout of a PD150
sheet that was also used for a SC150/649 printing. The only spot that remains to be
filled is the scratch that matches the O'Leary which should be a
non 649 subject if it follows the pattern of the other 16 horizontal positions.
The new scratch is this Bresnahan that matches Gibson.
Sheet [A-B] X Gibson-Bresnahan updated.jpgBresnahan.jpg
Bresnashan-Gibson%20Scratch%20Match.jpg
Bresnahan Back.jpgGibson 1.jpg
Bresnahan Crop.jpgGibson 1 crop.jpg
I also found this Conroy which was one of the secondary scratches missing from this sheet.
Sheet [A-B] X Large updated Conroy 5.jpg
Conroy 5.jpg
Conroy 5 Crop.jpg
I think layout of the other 649 sheet can be established by comparing back
flaws and assigning their sheet position based on the subject they match from this sheet.