The Jerry Jones electric sitar. This vintage sound has been used on many classic motown tracks as well as countless soul songs in 70's. It was also famously used to play the solo & licks in Steely Dans "do it again"
This superb sample is of a vintage Rickenbacker 12 string electric guitar as famously used on The Byrds and many other classic late 60’s early 70’s recordings.
It has been recorded using a vintage mic pre with a small amount of valve compression. It should work really well in your track consider compressing it still further and adding some chorusing or harmonizing in the mix.