I haven't seen another like yours. I have seen US Masters basses where the neck extends beyond the end of the fretboard and the truss rod access hole is cut into the end of the neck with no cover.
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I have a few of their basses. All play really well. great necks. electronics - nothing special..... lousyt resale value so i was able to pick them up in the 500 or less range where a new one sells for around $2000.