If I recall correctly,, these guns were the "overrun" batch from the ones built for the San Diego PD. No special markings.
But,, as noted,, only about 200 made.
These are sleeper rarities.
I wouldn't sell one at regular Vaquero prices.
Advertise it here,, and put an appropriate value on it, and a collector may well appreciate owning it. But condition and the complete package make a big difference. A NIB one,, with all the correct stuff vs a fired, used, and missing box gun is a big difference.
Due to rarity, I'd put a value of $1100-$1200 on a NIB one.