Sc#346 1923
Postmark 10th February 1933
Perfin BPB (Blunt pins, or sheet folded too many times)
La Plata / Buenos Aires + Sucursales Banco Provincia d. Buenos Aires BPB 1913 - 1951

1923 San Martin Lithograhy v Typography ID
Fairly self explanatory, note teeth
Lithography have small holes, Typography Large holes.
The typography issues, were designed for automatic machines, also referred to as "coil stamps"
(My suggestion) ...hence the larger clean perforation punctures.
Shades? my collection evidences large variance of shades in the 25c issue.
No mention of shades in SG or Scott?
Please excuse the bent tooth.
