Never carry on half-cock.
Carry it one-up, hammer down.  First shot double action.

THEN

Save up for something better as the 7.65 is a little low on stopping power.

If it has a half-cock or firing pin block, yes. Hammer down.

If it doesn't have a half-cock or firing pin block, there is no way I'll carry it hammer down with a round chambered. In that case carry with safety engaged. If that means the pistol must be cocked, so be it. Still safer than hammer down.

I know someone with that shot a hole through his right ass cheek when his dog jumped up. The dog's paw brushed the hammer of his holstered CZ75 pre-B and pulled it back just short of the sear engaging.

If a CZ75 preB is  partially cocked then the half-cock will catch it and prevent firing.  I am afraid your friend's CZ75 has either been modified or it broke the half-cock position on the hammer. It could also have had a very weak firing pin spring and an extremely soft primer in order for it could go off the way you describe.

Engaging the safety on as CZ70 will safely drop the hammer.  The double action trigger pull is pretty stiff and is an added safety feature.

The CZ70 does NOT have a firing pin safety. It can however be safely carried one-up, hammer down. If you are really paranoid, then by all means keep the safety engaged while the hammer is dropped.  You would then have to disengage the safety in order to fire.  Your first shot would still be double action mode unless you manually re-cock the hammer.

A pre-B does not have a half-cock. Also, the safety can only be activated when cocked. There may be some transitional models that may have a half-cock, but the OG versions do not.

This CZ70 is not my pistol. An old woman gave it to an acquaintance.

I have only once seen this particular pistol, so one would need to investigate it to determine the setup.

For safety measures, it seems that cooked and locked might be the solution.

A pre-B does not have a half-cock. Also, the safety can only be activated when cocked. There may be some transitional models that may have a half-cock, but the OG versions do not.

Can confirm mine does not have a half cock.

If it has the half-cock, hammer down one up.

If no half-cock, safety on.

T

This CZ70 is not my pistol. An old woman gave it to an acquaintance.

I have only once seen this particular pistol, so one would need to investigate it to determine the setup.

For safety measures, it seems that cooked and locked might be the solution.

The "safety" is a hammer drop device.  If you apply the safety, the hammer drops. 

The options are:
1. hammer down, safety engaged and
2. hammer down, safety disengaged.

Empty chamber is never really an option on a SD gun.

A pre-B does not have a half-cock. Also, the safety can only be activated when cocked. There may be some transitional models that may have a half-cock, but the OG versions do not.

My CZ75 Pre-B (matt blued from the factory, made in 1985) did have (and still has) a half-cock notch.

Yes, half cock is definitely not a safe carry mode.

I also own two pre-B's and they both have half cock notches in the hammer.  A close friend of mine with a 1987 CZ85 also does have a half cock.  Apparently the cz75's manufactured before 1980 did not come with the half-cock position.

The half cock notch can break very easily if dropped on on the hammer with the hammer in half cock position.

'Pre-B' is a bit of a kludge as far as designations go with there being a hell of a lot of 'transitional' configurations of the 75. I imagine that the reluctant commies in Chekoslovakia smashed out as much as they could put together with whatever parts were at hand in pursuit of that sweet hard currency forex. As best I can tell there were no firm cut off dates or definitive serial number ranges that can be discerned until well after the end of the commie era.

Some sort of thick plastic stopper snugly under the hammer in front of firing pin
Just pull out when ready to fire
If done properly should stop all AD's