Underlever,
Here is the link to a basic Merkel grade description. As you can see, Merkel's Blitz actions did not have the under bites as did the Merkel A&D's.

http://www.hallowellco.com/traditional_merkel_grades.htm

I have six Merkels ranging in proof dates from 1926 to 1941, one rifle, one combo (two barrel set) and four shotguns. Several appear to have been shot considerably but have the same SNAP! on closing that the high condition guns do. It is apparent that the under bites are unnecessary in this design. I have a Kessler Blitz actioned rifle (1938) and a Stiegele Blitz combo (1927) and they too are tight 'like new'.

As you have noted these rifles handle beautifully. My two O/U rifles and two combos have the feel of a shotgun in the hand and are among my favorite guns. The Blitz action can be disassembled with three screw driver blades in a few minutes and nearly all parts are totally accessible on the removed trigger plate. This may sound like a trivial distinction but three years ago I hunted deer on Montegue Island here in Alaska. It was late November and we were in miserable mixed snow and rain every day all day long. I was hunting with the 1926 combo (7x65R) and to properly care for it I had to remove the butt several times. After having experienced the Blitz actions I've never been tempted to acquire a Merkel A&D.

Anyway, very nice rifle and a superb cartridge that you have.
Dennis