Below are selected Buenos Aires 23 images. Here is a link to the main Buenos Aires Numeral Postmarks page. Illustrated below left is a 5c1Et with a somewhat worn impression. Below right is a detail from a cover showing a 30c stamp, likely a 30cNGR, and a 1P stamp, also likely a 1PNGR (1946 is a common year of usage for the NGR printing). The two examples shown are different Buenos Aires 23 postmarks.