A well-formed, hand-written O is indistinguishable from a well-formed, hand-written zero. Literally, no amount of effort will make it clear which one is intended, short of some agreed-upon convention to use a different glyph like a slashed O for zero.
This is not true of G and 6 or B and 8. If these are well-formed, they are completely distinct.
People who paid for their post code are motivated to write the code clearly, for fear of nondelivery; but no amount of motivation will fix 0 versus O.
> The handwriting '1' looks like a 'L'.
It certainly does not. Rather, the lower case l is easily confused for the digit 1. This postzegelcode doesn't use lower case.
I don't see it mentioned that I is avoided because of 1. The likely reason is that Europeans don't write 1 just as a stick. It starts with an angled upstroke. That upstroke makes it possible to confuse the European 1 with an American 7; but the European 7 has a horizontal stroke across its stem which thwarts that problem. (I addition, a cursive 7's upper horizontal stroke is actually wavy, like a tilde.) Confusion of I, 1 and 7 in European handwriting is next to nil.
> The likely reason is that Europeans don't write 1 just as a stick. It starts with an angled upstroke.
I'm European, and that's how I write it, but if you look at the link, that's not how they write 1's in the promotional material - Those 1's follow pretty much the stroke I would do for an L, only the foot is shorter and slightly more pointed upward.
I see that. Yikes! The hand in the photo (we are to undestand) copied a pair of nicely typeset 1s, featuring with an upstroke and serif foot, into a pair of sloppy hockey sticks that looks like lower case l's due to the pen trails, and could be taken for I.
This is not true of G and 6 or B and 8. If these are well-formed, they are completely distinct.
People who paid for their post code are motivated to write the code clearly, for fear of nondelivery; but no amount of motivation will fix 0 versus O.
> The handwriting '1' looks like a 'L'.
It certainly does not. Rather, the lower case l is easily confused for the digit 1. This postzegelcode doesn't use lower case.
I don't see it mentioned that I is avoided because of 1. The likely reason is that Europeans don't write 1 just as a stick. It starts with an angled upstroke. That upstroke makes it possible to confuse the European 1 with an American 7; but the European 7 has a horizontal stroke across its stem which thwarts that problem. (I addition, a cursive 7's upper horizontal stroke is actually wavy, like a tilde.) Confusion of I, 1 and 7 in European handwriting is next to nil.