All About Pocket Knives

This knife was made by Olbertz - appears to be a tool knife - any ideas as to what it was designed for?

knifeaholic wrote: ↑Tue Apr 15, 2025 3:54 pm This.....

I have no idea what the one tool is.
But, I think the square in the handle is a Prest-O-Lite key.

Miller Bros. has answered this before. It is a painter's knife for removing doorknobs and opening the door once the knob is removed. The square taper is used to open the door once the knob shaft is gone. The fat slotted end can also be used for opening paint cans.

btrwtr wrote: ↑Tue Apr 15, 2025 6:00 pm Miller Bros. has answered this before. It is a painter's knife for removing doorknobs and opening the door once the knob is removed. The square taper is used to open the door once the knob shaft is gone. The fat slotted end can also be used for opening paint cans.

Thanks so much!! I knew that I had seen this answered before, but my searches did not turn up the older threads.

Cool knife and great explanation.

btrwtr wrote: ↑Tue Apr 15, 2025 6:00 pm Miller Bros. has answered this before. It is a painter's knife for removing doorknobs and opening the door once the knob is removed. The square taper is used to open the door once the knob shaft is gone. The fat slotted end can also be used for opening paint cans.

You've got a good memory my friend.

New_Windsor_NY wrote: ↑Tue Apr 15, 2025 4:09 pm

knifeaholic wrote: ↑Tue Apr 15, 2025 3:54 pm This.....

But, I think the square in the handle is a Prest-O-Lite key.

For future reference and researchers, a Prest-o-lite wrench is approximately 3/16 (0.1875) inches square. The doorknob shaft is approximately 1/4 (0.250) inches square. While the painters tool might work (with some slop) for the Prest-o-lite valve, the reverse is not true - most Prest-o-lite key holes are too small to fit a doorknob shaft. viewtopic.php?t=50466

BTW, contrary to popular myth, neither will work as a skate key. See above linked thread and Dennis Ellingsen article from Knife World for details. Click on the article to enlarge it to legible size.

Ken