The 'new generation' Saab 900 was built under General Motors stewardship, which meant engineers had access to the 2.5-litre V6 that was used in the Calibra and Omega. It was also offered in the Saab 900, but very few were sold - certainly in the UK. According to DVLA data, there are 29 900 SE V6 autos on the road. As such, valuing one is extremely difficult as so few come up for sale. Prices for this era of 900 convertible are held back by its GM heritage so even a very good one is only worth about £1500-2000. You may be able to ask a bit more for yours given the engine.