I made this a few years ago, it never got properly finished until recently.
The saw blade is for a folding garden pruner which was well used (hence the irremovable staining!) until the handle broke - well, what else would anyone do with a perfectly usable and still sharp blade?
So it got repurposed, along with some mild steel flat bar, scrap wood and Meccano gears in a custom brass housing, the drive wheel is Mamod.
And it works quite well - here with the Jensen 65 for which a firebox repaint is overdue:
Hope you like it
Dave