The first formula card of the first Republic Latvia has the ‘sun’-design with L ***: the provisional state arms. This is the first printing, end of 1920.
In the first printing -1920- the first bracket of (Latwija) is placed under the first ‘A’ of PASTKARTE.
In 1921 a second printing is produced: the card here below to Leipzig in Germany.
In the second printing-1921- the first bracket of (Latwija) is placed under the ‘S’.
Lettland Handbuch Philatelie und Postgeschichte: die Ganzsachen und postamtlichen Formulare 1918-1940 / Harry von Hofmann (red.)
Hamburg : Harry von Hofmann Verlag, 1997. – About these cards: p. 12-13
Other differences according the handbook:
Printing 1920, in the handbook numbered V
Lower arm of K and R in PASTKARTE is more downwards and PASTKARTE 25 mm long, printed on a thin card
Printing 1921, in the handbook numbered VI:
K and R in PASTKARTE is normal and PASTKARTE 28 mm long, printed on thicker card
Printing 1921 has two varieties:
VIa paper is horizontally stripped
VIb paper is vertically stripped (the card above)
Both cards: format about 13.8 x 9 cm