Conversely, I disagree; and assert that it is rather John Gruber who has not used nearly enough open ended spanners.

If one has only ever used modern forged steel spanners, then one might think that they aren't this width, and have the jaws at an angle. But try looking at antique tools. There have been a lot of spanners over the past couple of centuries that have looked like the picture.

If I saw a spanner like this in real life, I'd be thinking first half 20th century, possibly from a motorcycling kit, and Imperial and useless. (-: