Diana Model-35B - Peerless.
With thanks once again to Mike D for these pics. He says about this rifle:
Like my 50M, this is a Stoeger-imported "Peerless" gun in .22 caliber. While Dianas of this era have no serials or date stamps, I'm guessing from the trigger details that it is slightly later in manufacture than my three model 50's. This rifle came from Myron Kasok's collection by way of the infamous Rock Island auction a few years ago.
A couple of interesting details--the barrel is slightly tapered, the only post-WW2 Diana I have seen thus. The "two-position" sight is a late variant featuring 20 clicks per revolution of the elevation wheel, and requiring a separate little socket tool to operate the windage adjuster.