Polish to English Art/Literary Military / Defense Museum labels

I'm translating labels for museum exhibits - antique guns, swords etc. The "wz." refers to when a model or prototype of a particular item was designed. It's mainly given as a year (e.g. 1777), but occasionally in another format (e.g. 98/29). This is then followed by a precise or estimated year of manufacture. Is there a standard abbreviation to denote the prototype?

Examples:

Bagnet pruski straży leśnej do karabinu Mauser wz. 98/05, Turyngia, Suhl, Simson & Co., 1915–1917 r
Bagnet piechoty do karabinu Mauser wz. 98/29 w pochwie, Turyngia, Marienthal k. Schweina, Bracia Heller, 1938 r