If you want top dollar for your car, this is not the place to sell it.
Nearly everyone here is very well versed in these cars and will know all of the places to look for weak points. That is, they will want to buy the car at a fair and reasonable price, not typically market price.
Your best bet is to go to eBay. People pay stupid prices for cars there, and you have some protections in place. You will pay a fee, but you'll also get a wider range of potential buyers who are willing to pay more for a car than any of us would. You'll also get the advantage of the auction mentality, where people will bid up an item more because they don't want to get beaten than because they want it....
I'm assuming you meant "garage kept".
Posting on a site like eBay will mean you should be as descriptive as possible with lots and lots of pictures, the more the better. Definitely state if you have service records, as that is very important to many MB people. If not, don't worry about it.
You'll need to establish a basis for the price. You can't just pick it out of the air or base it on what your husband paid - he may have overpaid!
The car looks nice, but prices for the early SLs (also known as "R107" models) such as this one aren't that great in my opinion, as someone who really wants an SL model like this will probably want to go with a later year for a number of reasons.
I would avoid Craigslist as you'll get a LOT of lowballers and tire kickers wasting your time. You can try and see for a couple of days, but that has been my experience over many years of buying and selling used MBs.
if you want to invest the time and expense, you could go to someone like John Olson who has the "SL Market Letter
" to establish a general idea of value. John is the expert on SLs and is very well respected in this regard. He publishes values for all SL models on a regular basis, however, access to this information does require a fee.
Good luck with the sale,