Brigada and Ambulante explained

Based on information from aficionado, a member of the Filatelia Argentina forum, the Brigada postmarks are the first type for the roaming (Ambulante) service for mail from Buenos Aires to the interior of the country. I previouly did not know what the Brigada postmarks were for, or that they are an early type of Ambulante postmark.

Here is a Brigada 18 example.



Here is an Ambulante No. 92.