10cm vz14/19, witch country?

[Dandebur]

Hello.
In the forum cartridges, it was recently talked about the 10cm wz 14/19 ( 100x130R and 100x182R ) made by the Poles. I don't knew these cases.
This year, I have found a case of 100x182R but of unknown country. Perhaps Yugoslavia due to the stamping BT3 on the primer? I had before a case of 4cm vz36 ( 47x405R ) made by a Czech firm but with cyrillic letters stamped on it. Perhaps contract also for Yugoslavia? Note the letters NP in a circle on the two cases.
Any comment will be appreciated.
Pic 1: 100x182R Czech, interessant by the fact it has yet the ink stampings.
Pic 2: 100x182R unknown.
Pic 3: 4cm vz 36 contract ?
Regards,
Dandebur.

 

[Dandebur]

Sorry for my mistake: there is not the letters NP on the two cases. I was tired.

 

[Alpini]

The second one is from Yugoslavia, ВТЗ is Voini Techniki Zavod in Kragujevac.

The last case should be made for Bulgaria.

 

[Dandebur]

Thank you very much Alpini. It is exactly what I wanted to know.

 

[Hoeksel]

Wow, not seen before a 47 mm Bulgarian case. Very, very nice! Now on my want list.