Partly answering my own question:
I found this (small) listing
Azores, Madeira
Note that used stamps with genuine overprints have the following numeral cancellations:
1853–69: 48 Angra do Heroismo, 49 Horta, 50 Ponta Delgada or 51 Funchal.
1870–78: 42 Angra do Heroismo, 43 Horta, 44 Ponta Delgada or 45 Funchal.
I am looking for a list that shows me what Portuguese town / municipality / island or whatever goes with what old numeral cancel. Can anyone help me with this?
re: Portugal numeral cancels
Partly answering my own question:
I found this (small) listing
Azores, Madeira
Note that used stamps with genuine overprints have the following numeral cancellations:
1853–69: 48 Angra do Heroismo, 49 Horta, 50 Ponta Delgada or 51 Funchal.
1870–78: 42 Angra do Heroismo, 43 Horta, 44 Ponta Delgada or 45 Funchal.