From the extra piece of horseshoe trim above the stops I would judge this to be a Martinique or Tampico both available in the early 70's. It is a great sounding instrument and looks well kept in your pictures.
Unfortunately the organ market is at rock bottom right now. Don't sell it if you have any way of keeping the organ, because best offer on an instrument of this age is about $100 today.
That's dictated by the fact that electrical components are aging and anything may give out at anytime. As repair parts can be costly or hard to find only a few dedicated hobbyists are working with these instruments now. Having professional repair is always a great idea if funds are available, but again buyers weigh those potential repair bills in the cost of acquisition.
Another component of the sales situation right now is the buyer who is collecting Conn organs may be at some distance from you and have to allowing for trucking expense (either Uhaul or professional).
First option for sales today would be your local craigslist (to minimize distance as mentioned above) and secondly www.theaterorgans.com where free classifieds are available that reach a wider audience where someone may be waiting for just such an organ as this.
Best wishes and thank you for asking the forum.