Interesting catalog, do you have any idea of what year it was put out?
Final thought on the tool.
For shaping Himalayan rock salt.

QuoteFor shaping Himalayan rock salt.
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Here is another excellent reference to old tools. (prices subject to change without notice  )

https://books.google.com/books?id=mv8GAAAAQAAJ&pg=PA200&dq=%22brick+axe%22&hl=en&sa=X&ved=0ahUKEwiqiqvI9ePNAhUMWh4KHakjDl4Q6AEIMjAC#v=onepage&q=%22brick%20axe%22&f=false

A friend suggested that it could possibly be a curved version of a "brick axe" for hard to reach places but still no actual illustrations have been found.

The search goes on. Off to the Himalayas. 

 I am still sticking with; stone mason chipping hammer.