I’m not sure we don’t share a bit of common ancestry. I think your yellow handled knife there is an AG Russell, but could be wrong.I've increased my pocketknife collection this year but so far have found 2 to be firm favourites.
At home and out and about it's a Case Sodbuster Junior carbon.
For work it's a QSP Penguin Mini. I know this is a locking knife, so doesn't really fit the OPs criteria, but the one handed opening massively increases its usefulness at work for me.
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Not all these are in daily rotation, but those that are are in the second pic. The Civivi Baby Banter is a little gem of a knife, and only upside down because the torch that was on turbo to provide the lighting was getting too hot


