Difficult to say without more detail but the key issue is the chassis/bulkhead/cross member condition. Engines are economical to replace, chassis isn`t unless you do it yourself. Given that nowhere in the Bahamas is far from the sea I`d be more concerned than usual about corrosion
Assuming those are okay, with a tropical roof (which it has), running well, road legal, good MOT and history showing well looked after, my gut feel is about £1500 round where I live in the soft South East, 2000 if its better than it looks, 1000 if worse but still with the plus points above.
As a guide I spent £4500 on restoring my 109 over a period of years and sold it for £1500 a couple of years ago, and it was in (way) better condition than the one in the photo. Since then UK values for series 3`s seem to have recovered a bit but there are absolutely no guarantees, it still needs a willing seller and a willing buyer and a lot of luck to get a decent price.
ps cute spaniel as well.