Bait Identification Help

[ecu1984]

back story
My son was trout fishing today, in our "go to" spot
using our "go to" Mirrolure and took a friend with him.
Son (who is a dang good trout fisherman) caught two and his friend
caught 9 with this bait right off the bat while in the same boat. His friend had two of this lure and my son tied
the other one on and commenced to wearing them out for two hours.
The friend didn't know the name or where he bought them, they were loose in his tackle box and
were several years old. The fish definitely liked it today, on the bottom and fished slow with no jerk or twitch.
Just a straight slow retrieve