As one who has purchased multiple Lefever shotguns, and also bought a lot of Lefever parts online, I strongly believe that you would get more for an intact and functional, if imperfect, Lefever E Grade gun than you would from parting it out. And without the correct tools and disassembly knowledge, you could even cause more loss of value than there already is.
I recommended Gunbroker.com purely because it is the largest internet gun auction site. Gunrunner.com is another option that has gotten much bigger in recent years. I used to never mention Gunrunner here because I got some screaming deals due to the former limited audience it had. Those days are over. Having a large audience insures the most exposure to potential buyers. A big audience is great for the seller, but not so good for a buyer. The overall fees for selling will be higher than the fees for selling it here would be. On the other hand, you are not obligated to sell it here if the offers you receive are unacceptable.
Local Auction houses can be hit or miss... depending upon the crowd, the weather, the amount of advertising the auctioneer does, and the day of the week. But when the gavel bangs, there is nothing you can do except take what you get, minus fees. Don't forget, with a serial number under 28916, your Lefever is a pre-1899 Antique, and does not require an FFL transfer to sell or ship to most places, except some that are ruled by anti-gun Liberal Left Democrats who impose stricter local sales restrictions.
