These are 2 lenses for the Arriflex 16mm Camera, with 16mm coverage. Both are the original Arri standard mount, need the lid for focusing.
Both of them look very good on the outside, the focus and iris works smooth and fine, has front and back covers.
The 16mm has nice glass too, the 25mm's rear lens has some scratches, the front lens some degradation, i can't tell if it's the coating or the glass. So, i'd say it's perfect donor if you have good lenses in a beaten up housing.
Feel free to ask more photos of any details, i'll try my best.
I have some more Arriflex and Bolex parts, have a look and make sure you ask for an invoice to save on combined shipping.