Herb,
You are thinking of the Sudicatis night sight. It was a "kit" consisting of a rear and front sight that had radium inserts. It only fit on a LP08 and did not require any modification to the gun.
(Noticed your "survivor" patch. I arrived in Viet Nam during Tet 1967 and left during Tet of 1968. Interesting year.)
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If it's made after 1918...it's a reproduction
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