Sankor 16 100mm F2.2 16mm Cine Projector Lens No. 7138.

I don’t know anything about this it was from an estate.

Info given to me about this.

100mm is about four inches, twice as long as the 16mm 'standard' lens of two inches. That gives it a telephoto effect, able to 'throw' the film image twice as far, to cast the same size of image that the two-inch lens casts onto a screen at half the distance.