Due to the soft nature of "puree" i.e. literally "mashed potatoes", no sane person would use it for barrel verbiage, the only reasonable behavior upon reading it being to flee away as far away as humanly feasible from such a gun.
Doubtless, some letters are missing from the word, either at the stamping, or far more likely at the reading stage.
"Purete" is possible but far more common would be "surete"
respectfully,
WC-