In 2003 Marlin made 2 "special run" lever actions.
The 410 was one and the original 336y "spikehorn" was the other.
The only reference made to the quantity of 410's made is "limited production". They are neat shotguns and pretty much only hold a unique/collectors value IMO. It had a 2.5" chamber and with a cylinder bore they never patterned that great, plus the weight made it heavy for a 410.
OP,
Based on the fact yours is NIB and these were a limited production shotgun, I would think you could sell it for $1300-1500 to the right buyer.
I'm not saying that's what I think it's worth...... but someone may buy it for that.
If you had a 410XLR in mint shape, that would be a different story.