VERY RARE!
...The holy grail of modern collecting.
A few of these were misprinted in the 1970s.. and somehow bypassed all quality checks.
Just a " B " Stamped on the front. You can barely see the "all" under just the right lighting and angle... under normal conditions, they appear completely absent. also only says “MAS” missing the “ON”
No lid; easily replaced with a period lid.