The 20 centavos large format cattle is one of the most beautiful stamps ever issued. Not only is it a beautiful design, it was also a regular definitive, a "lowly" definitive.
The stamp was issued in 1942, and is found on the 1E3 paper (previous two blocks), 1E4, 2D (straight rays diffused paper of 1943), 2D, and 1L. Below is a section of a 2C block.
Here is a somewhat random selection of covers bearing this stamp. The usage period, 1942-1951/2, coincides with World War II and a few years after.
