I believe it. From what I gather they are all good unless they've been abused
I could be wrong but your lens in those photos is marked Opton T which makes it post war from Oberkochen.
I think they changed serial # series when they moven to west germany...perhaps that's why you are dating that example to 1936?
The 50/1.5 Sonnar usually isn't absurdly expensive, and it's one of the best 35mm lenses on earth. Well worth picking up if you get half a chance. (There's one at KEH now for US$119, but it's in UG condition.) The 85/2 is a real winner as well.
Unfortunately the good ones are going the way of the Leica Summicron now, i.e. getting real pricey. Three years ago one could find a clean one for $150 or so, and now the same lens gets at least $300. The 5cm F2 Sonnar is fortunately a little cheaper and still a very good lens. The J8 is good for the money too particularly the later production ones (in my experience).