I have a S&W model 36 I would like to price. I have looked on the internet and prices are all over the place depending on year of manufacture, dash vs. no dash(?), etc. I found a site to search by serial number but got a message that said s/n not recognized. I believe it is an older model. Is there a way to pin the price down? I usually use the internet for selling prices but I’m not having much luck on this one. Thanks for any comments or suggestions.