Here is a very nice 5 1/2ppi rip saw made by the Delaware Saw Mfg Co. of Philadelphia. The plate is nearly full size. It is clean and straight with a bold etch.
The 5 1/2ppi rip teeth have been freshly sharpened:
Tooth Type: rip
Rake Angle: 7º
Fleam Angle: 0º
Slope Angle: 0º
Tooth Set: 0.012"
