rustyric,
I agree with Bill H. above. Not a tappet wrench.. too thick.
More likely a longish angle wrench. The wrench number in the photo does not show the alpha prefix... if it is an angle wrench it should start with an "AW" followed by a number. Also, if it is an angle wrench both open ends will be the same size (which it has, i.e. 3/4" x 3/4").
Hope this helps...