I don't think commemoratives are a good investment, if that's one of your reasons for buying.
I speak from personal experience.
Most typically sell for the same or less than a similar non-comm. example.
I bought this model 586-3 on GB just because I thought it was very handsome,
and I had just started in the hobby.
Also came with wood display case.
It is a INS (Immigration & Naturalization Services) comm.
They only produced 183 examples, so I thought it would turn out to be a good investment. After owning it for about 6 years, and living it's life in my safe (and not enjoying it as I thought I might), I decided to sell it. I advertised it many places, including this forum, and it took over a year to sell (not here), and I got perhaps $50 more than I paid, even though super-low production. INS is now part of DHS. My gun was also unfired after leaving factory. I bought it from the original INS agent that ordered it after his retirement, including every piece of paperwork for the order. The agent passed away about 6 months after my purchase. It was being sold to help pay for his medical bills.
That is the last comm. I will buy, unless I find one priced the same or less
than the same model that's not a comm.
No more safe queens for me.
Good luck with your purchase.