Ahh gotcha.
If it was a 5" gun it would command a substantial premium.
That said, it is still a very nice gun, and pre lock blued 29s are still quite desirable. If you can be patient, you should be able to get a grand from the right buyer. If I missed it, sorry, but I am assuming it has a hammer mounted firing pin. It should from that era.
I would advertise that fact. The hammer mounted FP and pre-lock are generally more desirable features than non fluted cylinders. To advertise it, I would take pics of the FP, the breech face (to show lack of wear) the end of the box with the corresponding info (for collectors), the muzzle, and the back strap (again to show lack of wear).
If it were mine, I would stay at a grand for it.
Hope this helps.
I am a big fan of M29s, but I have more than I will ever wear out from shooting in my lifetime at this point.