I've had a Trailrider holster like this one for a few years and it is designed to protect the sight but leave the grip exposed for an easy draw. The flap covering the sight and hammer is a thumbsnap so you unsnap it naturally as you draw.

[Linked Image]

http://www.gunfighter.com/trailrider/tr_holster3.html

The leather is serviceable but a bit stiff, not the supple, thick leather of some of the nicer makers. If anyone has ever had an unlined Simply Rugged Sourdough pancake holster the leather thickness reminds me a bit of that. They do make a lined version but I couldn't comment on it as all I've owned is the unlined version.

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!