All my basses are rare, being left-handed π
I used to own a lefty Aria SB-1000 that stands out - you just never see any. The set-neck models come by once in a while, but the neck-through models are very rare. Mine had two extra pickups installed, and was originally fretless but had been fretted by a previous owner.
My Ibanez MC924's are also kind of rare as lefties. Rumour has it there are only about 250 in existance. I had been looking for one for a few years, and then found three within a couple of months and bought all three, and kept the best two. Fantastic basses. My 1983 is an absolute keeper (it's just one month younger than I am).
And I own an Esh Stinger that is somewhat unusual, especially as a lefty. It's a fun bass, with two EMG DC35's and a piezo bridge. Lots of punch, and a bright and powerful attack. Cool looks too, with the sandblasted ash with blackened grain beneath a white finish. It looks similar to this one, but left-handed, with a deeper neck pocket and longer heel, and with two big EMG soapbars. Controls are volume, passive tone, 3-way rotary pickup selector and 4-way "Esh-tronic" switch: mag only, mag only bypassing all controls, mag + piezo, piezo only.