I am just starting to attend the local gunshows on a regular basis and in my area we do not have a lot.
I am on Gunbroker, AuctionArms, and GunsAmerica a lot. I watch what is being sold and I put faith only on what is sold that started with a low bid. I also look at what is bid on a weapon that has too high of a reserve. For instance if the bids go to $700.00 on a S&W that has a reserve of over $900.00, that, to me is a possible indication of its value. People are willing to pay $700.00 and no more.
And again, as someone else posted, your "area" or "region" might indicate a difference in "market value" over another region.
I suspect in California, at a gunshow (if they still have them), your M27-2 would not have been too high. Based on the internet, your price might be okay IF the bidders are there to bid. Sometimes they are on vacation while you're trying to sell your gun.
As far as your local area and your desire to sell face-to-face I do not know. At our local gunshows it just depends on who walks in and what they are looking for. I have seen some nice S&Ws that I thought should have sold and they did not. I have seen some not-so-nice get scarfed right up.
Your current price, Christmas, and THAT one show probably all came together to cause a "no-sale". But at the next gunshow you might get it sold. Again depending on what they sell for in your area.
Two years ago, at the gunshow I passed up a NIB M27-2 blue 3 1/2 inch, with all the accessories for $700.00. Only because I already have one, in not as nice shape, that is a shooter. And the one I was looking at would have become a shooter as well. So I passed, BUT, I find myself sometimes thinking I should not have.
Good luck on your future attempts.