I no nothing about the original owner, but the person I initially received it from in 2018 said it is a Sonus TJ5 Set-Neck (set-in) fretless. Based on what I read on the Zon webpage about the builds of his Sonus basses, it's a custom build. It was originally an unlined fretless with the standard preamp when he bought it, but he replaced the original preamp with a Bartolini 5.2AP NTMB-GFL and had the lines and side dots added.
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