This is one of his old leica lenses, an elmar f = 9cm 1 : 4. The serial number (via google) tells me it id from 1937.
So that's an 81 year old lens.
I've ordered a leica L39 to Sony Nex adapter, which means I will be able to connect this old lens to my Sony Alpha 6000.
I will have to shoot using old school techniques, manual focussing, aperture priority, manual setting of aperture on both camera and lens .
The lens shows it's age, with a few scratches and chips on the outside. Old glass sometimes collects fungus, ,but this glass has no signs of fungus. There might be a bit of haze , other than that I think the glass is in good condition to my untrained eye.
So, an 80+ year lens on my 2017 digital camera !!!
Am I expecting good results? I've seen some sample images from other photographers on flickr and some are pretty good.
What you will get with a old vintage lens is probably a warmth to your photos, Anyway we will see
This is new to me. My brother-in-law had (I don't know if he still does) a set of lenses of an old camera which he wanted to give away for free and I refused them because they could not connect to my Nikon. I will now have to ask him if he still has them and see if I could something like you did. Enjoy your new 'old' lens. Looking forward to see some of the results.