Salaams, Ibrahiim.
Thanks for referencing the seminal thread started by Jim. It lays the historic basis for later Sudanese smiths to tie, adapt and identify their work with a reference to quality and the Crescent Moon's symbolism in Islam. My guess is the Crescent Moon's design elements when adapted with a little imagination looks like 40 in Arabic numerals. I see nothing significant in the number 40 as such.
Regards,
Ed
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