Here we have a Vintage MADE IN GERMANY (Pat. 1928) 'F-Style' Sliding H. Duty Bar Clamp No. 3,  8" Open Capacity.   There is no maker name on the clamp.  It is stamped "3"  "MADE IN GERMANY PATENTED FEBR. 14, 1928".  It is also stamped D.R.G.M. (Deutsches Reich Gebrauchsmuster), which was an old German patent/trademark system used before 1945.  Clamp has a 3.5" throat depth.  This clamp is very similar to the WETZLER NO.3 clamp that I recently sold in that is has the same heavy duty iron / steel construction. Very good working 'used tool' condition with wear from use.  Handle has two short, tight cracks. NO cracks, breaks or repairs in the metal. The clamp weighs 3 lbs. (unpacked)!  Please review the pics to confirm condition !!