I have recently come across a factory 990L compact in .357 Sig. According to S&W there are only 15 of these made by them. I know this was not a very popular model. Can anyone give me an idea what it may be worth?

I have recently come across a factory 990L compact in .357 Sig. According to S&W there are only 15 of these made by them. I know this was not a very popular model. Can anyone give me an idea what it may be worth?