I believe the creator of Lica smuggled Jews out of the country. He would hire them then transfer them to a facility in the USA I believe. The US Military had to scramble to find lens manufacturers that could supply @ Lica quality. German lenses were no longer available to us. If I am misinformed please straighten me out.
First post. In the mid 50's my dad had me use a UV or Haze filter. I was 15. His main point of the filter was to prolong the life of the lens coatings. You can change a filter for a lot less than a lens.