Difficult to identify CZ brought back from WWII

[weird weapons]

Details
On LEFT side
"765" is in front of assembly pin hole
"17775" is over the grip
"DR" is on the top front of trigger guard

On RIGHT side
"17775" is on the far end of the frame.

Slide
"Ceska Zbrojovka A.S v Praze 17775" along the top

Barrel
Bottom side "17775" and what apears to be a circled "K"

Not even sure of the caliber. Some say its .380 while others remember being told it was a .32 at different times in the family history. .380 rounds fit well in the magazine.

Pictures





Any help is appreciated

[czechollector]

What you have is an early production CZ 27. 
'765' is the caliber, .32acp.
'17775' is the pistol's serial number.
'DR' is believed to be the marking for 'Deutsche Reichbahn', the German railway system.
'Ceska Zbrojovka A.Sv Praze' is Bohemian Arms Factory of Prague.
The 'circled K' is the 'Lion over N' smokeless proof.
The same magazine was used in the Cz24, which is .380.

[weird weapons]

as you can see in the picture there is no assembly pin/screw. Is that something that could be replaced. I want to say I have seen them available from some of the larger gun part suppliers.

[weird weapons]

NV. got the whole take down assembly. easy peasy.

Now I'm concerned that the hottest modern rounds might be too much for it and a couple google searches didn't really give any  information. Like they start talking about a 27 and then start talking about a different model an by the time they were talking about the cartredges I had no clue to which they were actually still referring to.