All mine were so old they were inherited.
I needed to cut several inches off a plywood box.
I took a chance and bought a 15tpi 14" saw from Toolfix this morning. It cost under £6 and did the job perfectly.
When I proudly showed my decorator/ builder currently transformng my cave, he laughed and said "They are cheap but you can't resharpen them. The steel is rubbish".
But for £6 it seemed good value for money. My dad wold have sniffed though. If it wasn't Sheffield Steel he wouldn't have touched it.
Truthfully, I hate the throw awy culture. I try and fix everything.