$5 sábanas

The sequence appears to have been:

The first notes had two handwritten signatures.

Colour
of series
Series
letter
ImprintAbbreviationSize of numbers
(left, right)
black A B Núm. large, large

Notes are also known with Vargas' signature printed and Chao's signature hand written. More research is required to determine when and why it was decided to make this 'halfway' change.

Colour
of series
Series
letter
ImprintAbbreviationSize of numbers
(left, right)
black A B Núm. large, large

Finally, both signatures were printed on the note.

Colour
of series
Series
letter
ImprintAbbreviationSize of numbers
(left, right)
black A B Núm. small, small

The abbreviation then changed to 'No. Núm.'.

Colour
of series
Series
letter
ImprintAbbreviationSize of numbers
(left, right)
black A B No. Núm. large, large
small, large

and, finally, to 'No. No.'.

Colour
of series
Series
letter
ImprintAbbreviationSize of numbers
(left, right)
Type of seal
on reverse
  A B No. No. large, large  
red B large black
red C
  D large purple

Some Series C and Series D notes have the printer's imprint slightly higher.