Brief von Portugal nach Hamburg, 1857

[pt.philatelia]

Hello forum members,
Good afternoon,

I have this letter that I still could not find what the 9 means. Any help is appreciated, please.
Letter from Porto (08/26/1857) to Hamburg (09/07/1857) with transit in Bayonne (09/04/1857), Paris (09/05/1857). Paid 25 Réis, valid up to the border, for a letter up to 3/8oz.
Could be the 9 postage due is 9 schillings ? Any idea which postal convention would apply in this case?

Thank you
Luis

[pt.philatelia]

Hello again,

Attached another one but from 1854 and with double rate. 50 Réis in Portugal for a letter between 3/8-5/8. Postage due 12½ but don't know where the 12½ comes from.

Thank you

Luis