KMZ accessory viewfinders

Hello All,

Does anyone know when KMZ started producing accessory viewfinders? I have just received an 85mm example, early type with metal front, almost pristine with bakelite keeper and passport.

The passport is dated 28.VII.1958 - I had not realised these items were made as early as that, most other examples Iґve seen with passports were from the 1960ґs and 70ґs. The accessory RF lenses seem to have been made from the very early 50ґs, so perhaps the viewfinders as well?

Any info gratefully received - ATB ChrisS.

I believe they were put on market around the early '50s
By sure the "reversed Universal finder" began its life in '47.
Regards
LP

Thanks for that Luiz - it does seem logical when you consider the marketing of the lenses.

Rgds ChrisS