Type I or II?

I have a 2022 polymer note and I cannot make head or tail of the serial number prefix info in the comments.

This is my note, scanned with a white background:

And now with a black background:

According to what I see, my note has the “Guardian” print process which the catalog says is a Type II

But in the comments, it says about the prefix:

Type I:  0~9 B/ก

Type II: 0~9 B/ข

What I would like to know is, in the two prefix options, how does that end symbol apply to my note?

You do have a type II note. 
 

The Thai prefix system is very unique but once you understand it, it’s not that hard to understand. For most of their notes they use the English letters A, B, C, D, E, F, G, H, J and are paired with the Thai letters ก, ข, ค, ง, จ, ฉ, ต, ท, ธ. 
New designs start with A/ก - J/ธ. It shifts a letter with  the second rotation and is A/ธ - J/ท. 
 

With the 20 baht polymer notes they printed type I starting with 0A/ก-9/Aก. Because of printing problems they changed printers and started with type II and 0B/ข and went through 4J/ธ. Your note is from the first rotation B/ข so therefore type II. It was switched back to type 1 and then again to type II. I’m not sure which type will have the new finance minister signature. They haven’t been seen in circulation yet. 
 

If you are more curious about Thai prefix codes, send a private message.

The problem is that the font doesn't match the squiggles on the note so you would need to know who Thai can be written, similar to how Latin or Chinese script looks very different in certain fonts/ writing styles.

Thanks both!

odd job

I have a 2022 polymer note and I cannot make head or tail of the serial number prefix info in the comments.

 

This is my note, scanned with a white background:

 

And now with a black background:

 

According to what I see, my note has the “Guardian” print process which the catalog says is a Type II

 

But in the comments, it says about the prefix:

 

Type I:  0~9 B/ก

Type II: 0~9 B/ข

 

What I would like to know is, in the two prefix options, how does that end symbol apply to my note?

I can't comment on the prefix as I have no idea how it works. To me, to tell the difference between the two notes is by looking at the transparent windows

Top one was the first issue, and bottom note is 2nd.

Please ignore me, if I am off topic here again. This is not the first time.

Type I, was/is made by De La Rue, we think possibly in their Sri Lanka facility. Type II is made by CCL in Australia.  

I think it is Pete that answered you on how Thai prefixes rotate …

For the 20 baht polymer have a look at my sheet … sorry its my tracking so you have to put up with my notes and colours.

You will see the Thai alphabet with 1st Cycle, 2nd Cycle etc … So as described above, more modern Thai notes tend to follow the pattern with A,B,C,D,E,F,G,J …. then the Thai letter that J pairs with, is the one that the next A starts with.  

So 1st note prefix is normally 0Aก … we write it that way (ก is the 1st letter in the thai alphabet) …. but is 0A prefix and xxxxxxx arabic/western numeral SN, the thai equivalent is 0ก and xxxxxxx in thai numerals.  Each of the prefix in the table below represent 10,000,000 notes (7 digit SN).  

When, as you see on the table, you reach the 9Aก prefix, it needs to move to the next Roman alphabet … B and ข (2nd letter in the thai alphabet).  Ignore me and TK, trying to find a mystery note … the one in red …. which is not confirmed, they started making it by CCL, so drawn in the type 2 table.  

4Jธ Prefixes as an example are split or straddling prefixes, so they can be found normally in 2 signatures or in this case 2 types.  In some notes we can identify the numbers, but in this banknote, BOT are playing with our mind, so we just look in the transparent window to identify type.  Bright 20 is Type I, dark 20 is Type II.  If you can share you SN for those split prefixes, it will help us identify the pattern.

And as on numista, you have the details of the different inks that are used.  There is the older red, non UV luminescent SN ink and the newer luminescent ink which glows orange under UV.

Hope that helps explain ? (Marc)

That looks very complicated, I will need to read it carefully!

I'm not sure I understand this yet.

I bought some more polymer 20 Baht notes, this is one of them, scanned with a white and black background:

The signature is AT, SS.

But this isn't a replacement, so according to my thinking this could be one of two entries:

The polymer looks like Type II to me.

So which line is it?

odd job

I'm not sure I understand this yet.

I bought some more polymer 20 Baht notes, this is one of them, scanned with a white and black background:

 

 

The signature is AT, SS.

But this isn't a replacement, so according to my thinking this could be one of two entries:

 

The polymer looks like Type II to me.

So which line is it?

 

You have a type 1 which is confirmed by the Thai letter ก. Where you underlined the prefixes in type 2, make note that the Thai letter is พ. Understanding Thai prefixes can be challenging at first.

Thanks, I may be starting to understand.

Is it true then that a person may have two 20 baht notes, each with the same Gregorian serial number on the right, but the Thai serial numbers will be different?

odd job

Thanks, I may be starting to understand.

Is it true then that a person may have two 20 baht notes, each with the same Gregorian serial number on the right, but the Thai serial numbers will be different?

Yes, that is true. De La Rue admitted to the errors and hence that’s why type 2 came into existence. The BOT did its best to remove them from circulation. I know that a few examples are known in collector hands. I was never lucky enough to find one in my change. Also the errors are only on A/ก. You need those two letters.