The top and middle notes is a matching pair of polymer and paper-based first prefix Portrait $10 0AA123456

The top note is a polymer and it has the Lee Hsien Loong signature with MAS designation.

The middle note is paper-based and it has the Hu Tsu Tau signature with BCCS designation.

The bottom note is polymer-based and it has the Goh Chok Tong signature with prefix 2BA.
The first prefix for the $10 polymer Goh Chok Tong is 2BA. There is no 2AA for Goh Chok Tong signature as 2AA has been used for the polymer Lee Hsien Loong signature. In May 2004, the polymer $10 with the Lee Hsien Loong signature was issued with the following sequence of prefixes, 0AA 1AA 2AA 3AA 4AA 5AA 6AA 7AA 8AA 9AA 0AB 1AB 2AB. Theoretically the Goh Chok Tong signature could have started with prefix 2AC but MAS had decided to start with 2BA

This is a pair of ladder $2 and $5 first prefix polymer-based note with the Goh Chok Tong signature with prefix 2AA

This is a pair of up and down ladder $1000 first prefix with the Goh Chok Tong signature with prefix 2AA

First Prefix $50 0AA from Hu Tsu Tau and 2AA from Lee Hsien Loong MAS designation Portrait Series

First Prefix $50 1HL from Lee Hsien Loong BCCS designation Portrait Series

First Prefix $50 3AA777777 from Goh Chok Tong and 4AA from Tharman Shanmugaratnam Portrait Series
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First Prefix $50 3AA000007 from Goh Chok Tong and 4AA000007 from Tharman Shanmugaratnam Portrait Series

First Prefix solid $2 Hu Tsu Tau 0AA777777 and Lee Hsien Loong 1AA777777

First Prefix $10 solid 0AA777777 and low number 0AA000007 from Hu Tsu Tau signature Portrait Series

First Prefix $10 solid 5BA777777 and 5BA444444 from Tharman Shanmugaratnam signature Portrait Series

First Prefix solid 333333 from Lee Hsien Loong MAS designation Portrait Paper Series.

First Prefix solid 0AA333333 from Hu Tsu Tau

First Prefix $500 Ship A1 444444

First Prefix $500 Ship A1 000044

First Prefix AA low number from Ship Series

First Prefix C series from Ship Series