Great Western Railway - Air Label
On the 27th April GWR was authorised by the Postmaster General to carry air mail on their routes in the same manner as Railway letters. They issued their own air label rather than using the current railway stamp and started a service on the 15th May. This became the countries first air letter service. E.g. the letter is posted at the air destination and enters the postal system at that point.

The GWR (Great Western Railway) 3d Air Label.

The 3d label, the first of its kind to be officially used, is of interest. The labels were printed in blocks of 20 all perforate. The first sheet 000 - 019 was not commercially used and was initially held in the archives. Most of the sheet 005 - 0019, badly stained at the top was sold to a collector That collector removed the badly stained 005 -009 and sold it. The remaining sheet 009 - 020 remains in existence as the largest surviving sheet. There was another sheet that was originally held in the archives which was a sheet numbered 000 on every stamp and overprinted ‘specimen’. This was split after going from the archives and a block of four from the sheet is shown below.
The original artist drawing prepared by G. Sawyer which was submitted to Waterloo & Sons for the preparation of the printing plate. Note, the out of scale perforations which are shown round the upper half of the design and which were adopted into the final presentation of the label.
This block of four compared with the single examples sometimes seen shows that the 000 labels all come from a complete sheet numbered 000 and overstruck with ‘SPECIMEN’. The labels were printed in sheets of twenty with 5 * 4. Thus, this example in Row 1 numbers 2 to 5. When fully numbered they are numbered from the top right to the bottom left. This is possibly a printer’s final proof sheet.
This is the remaining block from the original block kept in the GWR archives. The first number on the labels which was flown was 20 (see next page). The numbers go from top right to bottom left, so the two rows to the right are missing and number 15 on the to left.
Copyright © 2022 Robert Farquharson All Rights Reserved

The M and A joining on a sheet.

As the printing plate began to wear an error appeared in the printing. Redgrove says that the error starts from numbers 4500 onwards and is not seen after 800. The error is seen earlier than 4500 but can be mild at the beginning. The M of Mail develops a serif and in the most extreme examples it is completely joined to the A. The error only occurs on the stamps that have a 3 or a 6. The complete sheet below shows that at number 2660-2679 the errors have not started. Redgrove is of the opinion with which most experts agree that the printing was done in two stages, with the red numbers being printed later as required. This explains why the severity of the error does not follow the numbers.
An example on a flown cover from Birmingham to Newton Abbot on the 17th July 1933.

The Spot Variety

The second variety seen on these labels is called the spot variety. A small blue spot appears just below the middle left of row 3, column 2. It was thought that the variety appeared from the beginning of the printing, but it can be seen from an early sheet, that this is not the case.
The spot is clearly visible. The stamp above for comparison clearly shows no spot.
Row 3,2 clearly has no spot. This from the first printed sheet which was originally in the GWR archives.
A larger block clearly showing the variety.
Finally, Redgrove said that he did not believe there were any labels above 9000. Whilst this is almost certainly true for used examples, the mint example here numbered 9758 shows that labels in the 9000 range were printed. I believe the highest recorded flown label number is 8970.
British Internal Airmails of the 1930’s

Dark Red Numbers

Occasionally seen are dark red instead of the normal bright red numbers. There seems to be no logic or consistency as the examples below show. There are examples in the 2000’s, 4000’s and 6000’s. If you look at the complete sheet shown above, you can see there are no dark red numbers, suggesting it is not a positional error.

Labels above 9000

Labels around the 5000 number give the most pronounced examples. The example in 5058 is noticeably clear.
The spot is clearly visible. The stamp above for comparison clearly shows no spot.
Great Western Railway - Air Label
On the 27th April GWR was authorised by the Postmaster General to carry air mail on their routes in the same manner as Railway letters. They issued their own air label rather than using the current railway stamp and started a service on the 15th May. This became the countries first air letter service. E.g. the letter is posted at the air destination and enters the postal system at that point.

The GWR (Great Western Railway) 3d Air Label.

The 3d label, the first of its kind to be officially used, is of interest. The labels were printed in blocks of 20 all perforate. The first sheet 000 - 019 was not commercially used and was initially held in the archives. Most of the sheet 005 - 0019, badly stained at the top was sold to a collector That collector removed the badly stained 005 -009 and sold it. The remaining sheet 009 - 020 remains in existence as the largest surviving sheet. There was another sheet that was originally held in the archives which was a sheet numbered 000 on every stamp and overprinted ‘specimen’. This was split after going from the archives and a block of four from the sheet is shown below.
This block of four compared with the single examples sometimes seen shows that the 000 labels all come from a complete sheet numbered 000 and overstruck with ‘SPECIMEN’. The labels were printed in sheets of twenty with 5 * 4. Thus, this example in Row 1 numbers 2 to 5. When fully numbered they are numbered from the top right to the bottom left. This is possibly a printer’s final proof sheet.
Copyright © 2020 Robert Farquharson All Rights Reserved

The M and A joining on a sheet.

As the printing plate began to wear an error appeared in the printing. Redgrove says that the error starts from numbers 4500 onwards and is not seen after 800. The error is seen earlier than 4500 but can be mild at the beginning. The M of Mail develops a serif and in the most extreme examples it is completely joined to the A. The error only occurs on the stamps that have a 3 or a 6. The complete sheet below shows that at number 2660-2679 the errors have not started. Redgrove is of the opinion with which most experts agree that the printing was done in two stages, with the red numbers being printed later as required. This explains why the severity of the error does not follow the numbers.

The Spot Variety

The second variety seen on these labels is called the spot variety. A small blue spot appears just below the middle left of row 3, column 2. It was thought that the variety appeared from the beginning of the printing, but it can be seen from an early sheet, that this is not the case.
British Internal Airmails of the 1930’s

Dark Red Numbers

Occasionally seen are dark red instead of the normal bright red numbers. There seems to be no logic or consistency as the examples below show. There are examples in the 2000’s, 4000’s and 6000’s. If you look at the complete sheet shown above, you can see there are no dark red numbers, suggesting it is not a positional error.

Labels above 9000