Wenger Can Openers

What we have here is Wenger can openers.  The upper left on the left end of the implement is about 1960.  The upper right is from the early 60s to 1975.  The middle left is from 1975 until about 1991.  The middle right is from 1991 or so to present.  And the bottom one is a combo tool from about 1991-1995.

Crumby has not used either of the openers on the top row to open a can.  That's because they are dangerous.  Their instructions always begin with;  Achtung Dumbkopf!

The middle row contains examples of the usual Wenger can openers the average humanoid is liable to encounter in these unregenerate days.  Note that the twain examples are seriously dissimilar.  The cutting edge of the one on the left is about 3mm shorter than the one on the right.  Therefore, the one on the right is the far superior opener and is Crumby's household can opener of choice.  Note also the relative positions of the nail nicks.  Those nail nicks make it easy to date the Wenger knives vended on EBAY, pre or post 1990.

Finally, the last one on the bottom is the fairly rare Wenger combo tool.  Even though the cutting edge is dull, the long length that is engaged with the can makes it an effective can opener.