Help with I.D of this Colt cap and ball model.

[roccoracer]

Can anyone help identify what model this Colt is? I think it's a first model dragoon but want to see what the experts say.

 

[magoo]

I’m not an expert but it my be a 2nd model dragoon because of the shape of trigger guard. I think the 1st had a more square one. The 3rd model had different cutouts on cylinder.

 

[38ExtraSpecial]

Looks like an 1851 Navy
Caliber?

 

[roccoracer]

Looks like an 1851 Navy

I think you are correct. I didn't measure the bore and thought all the 1851 Navy revolvers had the naval scene on the cylinder. It doesn't look like that is true.
It looks like this one was made in 1862.
Thank you.