The CIP has its foundation in Belgium over a century ago and well before the EU existed. A 1969 convention set standards and recognition among signatory countries for each others proof marks. While most are EU countries such as the Czech Republic among the current 14 signatories, it also includes Russia, UAE, Chile and the UK. Notable EU countries that are not signatories are Poland, Sweden and Croatia. The official language is French. Around 2014, CIP/N proof marks started showing up on CZ firearms as an additional proof mark to the Czech ones. In 2017, CZ started using non-CIP proof marks for the firearms they expressly intend for export to non-CIP signatory markets such as the USA (where no proofs of any kind are required). One can guess at whether this was done to reduce any potential backlog for registration of CIP proofing (but not the actual proofing process) on every firearm made. Can’t say whether there’s any buyer premium out there based on some perceived notion of greater value added for a CIP proof mark if both pistols are equal in every other aspect.
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