25c sábanas
Besides serial letters the 25c is known with different printer’s imprint, different abbreviations for ‘Número’, different sized numerals, different coloured seals and a variety of control letters. As the later dos caritas issue did not have a 25c value, these fractional sábanas continued to be issued until July 1915.
The sequence appears to have been:

M903b 25c sábanas
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (left, right)  | Type of seal on reverse  | Control letters | 
|---|---|---|---|---|---|---|
| black | A | IMP. DEL GOBIERNO, CHIH. | NUM. | large, large | large black | 
The very first issues had ‘SERIE A’ (25c), ‘SERIE B’ (50c) and ‘SERIE C’ ($1) as part of the print. Later issues just had ‘SERIE’ with the letter added (as part of the numbering?), while this issue kept the black 'NUM.'.


M903a 25c sábanas, Series C, small, large
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (left, right)  | Type of seal on reverse  | Control letters | 
|---|---|---|---|---|---|---|
| red | B | IMP. DEL GOBIERNO | No. NUM. | small, large | large black | |
| C | small, large | |||||
| large, large | 
The next issue removed 'NUM' from the plate, so the numbering now included a second 'No.'. The printer's imprint was also moved to within the frame.

M903d 25c sábanas
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (left, right)  | Type of seal on reverse  | Control letters | 
|---|---|---|---|---|---|---|
| red | D | IMP. DEL GOBIERNO, CHIHUAHUA inside frame | No. No. | small, large | large black | |
| E | ||||||
| F | ||||||
| G | ||||||
| H(?) | ||||||
| I(?) | 
With series H onwards, the printers added control letters on the reverse. There was now only one serial number on the right.



M903e 25c sábanas
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (right)  | Type of seal on reverse  | Control letters | 
|---|---|---|---|---|---|---|
| black | H | IMP. DEL GOBIERNO, CHIHUAHUA inside frame | No. | large | small black | A-XXC | 
| red | 
I | B=CCVII | ||||
| J | B-VVV | |||||
| K | D-MVI | |||||
| black | 
L | E-VIM | ||||
| M | F-MXI | |||||
| N | G-IMX | |||||
| O | H-NST | |||||
| P | F-DMVI | |||||
| Q | G-CLII | |||||
| R | H-VVIII | |||||
| S | I-XCDI | |||||
| T | ||||||
| black | 
U | H-LKC | ||||
| V | Y-MNR | |||||
| W | K-IBC | |||||
| X | L-CDP | 
The change in control codes from letters of the alphabet with pseudo-Roman numbers (such as I-XCDI) to letters of the alphabet with three or two letter codes (such as H-LKC) no doubt took place at the same time as the changes in the dos caritas. This would suggest that the first of this group dated to July-September 1914 and the later to November-December 1914.
The series then changed to double letters, first 'AA', then 'A A', 'B B' and so on. For some reason the Tesorería General seal on the reverse was printed in a variety of colours.

M903f 25c sábanas

M903j 25c sábanas

M903i 25c sábanas

M903h 25c sábanas
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (right)  | Type of seal on reverse  | Control letters | 
|---|---|---|---|---|---|---|
| black | AA | IMP. DEL GOBIERNO, CHIHUAHUA inside frame | No. | large | small black | T-GDET-GDE obviously stands for 'Tesoreria General del Estado'. | 
| A A | M-AN | |||||
| A A | M-CK | |||||
| A A | C-MK | |||||
| A A | M-KC | |||||
| A A | small blue | C-KM | ||||
| A A | small green | K-RK | ||||
| A A | small red | M-ARI | 
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (right)  | Type of seal | Control letters | 
|---|---|---|---|---|---|---|
| red | B B | IMP. DEL GOBIERNO, CHIHUAHUA inside frame | No. | large | black | S L 2,000 C-ARA | 
| 1-00 L-I L-UIS | ||||||
| 1-00 L-II C-ARA | ||||||
| 1-00 L-III CA-GF | ||||||
| 1-00 L-IV CH-MJ | ||||||
| 100 C L-IV CH-MJ | 
For the CC and DD series the printer added the date, so we can see that these were produced between 29 June and 23 July 1915. They also moved the Tesorería General seal to the face, so it is now printed in red, along with the serial letters and number.
200,000 and 125-M (125,000?) may be print runs though the five-digit serial number does not support this. E and 2E may be emisión and segunda emisión. T, L, E and S may refer to different machines or locations.

M903k 25c sábanas
| Colour of series  | Series letter  | Imprint | Abbreviation | Size of numbers (right)  | Type of seal | Control letters | 
|---|---|---|---|---|---|---|
| red | C C | IMP. DEL GOBIERNO, CHIHUAHUA inside frame | No. | large | red | E-6-29-15 200,000 | 
| E-6-30-15 200,000 | ||||||
| E-7-5-15 200,000-III | ||||||
| E-7-6-15-T  200,000-IV  | 
||||||
| E-7-7-15-L 200,000-5 | ||||||
| E-7-9-15-L 200-000 6 | ||||||
| E-7-10-15-L 200,000-7 | ||||||
| E-7-12-15-T 200,000-8 | ||||||
| red | D D | IMP. DEL GOBIERNO, CHIHUAHUA inside frame | No. | large | red | 2E 7-14-15L  125-M-I  | 
| 2E7-16-15L  125-M-II  | 
||||||
| 2E 7-20-15L  125-M-III  | 
||||||
| 2E7-21-15T  125-M-IV  | 
||||||
| 2E7-22-15E  125-M-5  | 
||||||
| SE7-23-15S 66-M-U | 
One can note the progression of the Tesorería seal over time. The rough original seal was replaced by a finer seal with a break across the ‘O’ of ‘TESORERIA’. This then developed a crack in the rim at 1 o’clock.
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Revalidations
Early 25c notes were occasionally revalidated with local resellos.
25c note (K 38716) with San Luis Potosí resello

M904g 25c (M 79340) with Morelia resello

M903e 25c (N 74485) with Toluca resello

M903e 25c (P 35156) with Huauchinango resello
Notes were also revalidated in accordance with the Convention's decree of 17 December 1914. By 3 May 1915 17,431 notes with a value of $4,357.75 had been revalidatedLa Convención, 3 May 1915.
M903g 25c sábanas
                    
 
 


