Pruning Saw Sharpening

As part of a recent homeowner project, I applied a file to dull pruning saw that, as far as I can recall, Came With The House™ and has been untouched for decades:

Pruning Saw sharpening - top view
Pruning Saw sharpening – top view

Yeah, that’s a lot of steel filings; it was really really dull. Notice how they’re neatly lined up toward the blade?

It looks better from the side:

Pruning Saw sharpening - side view
Pruning Saw sharpening – side view

Despite my crude technique, it cuts wood like a hot knife through butter.