Unknown tool?

[1stkam]

I found this in my workshop and have no idea what it is. It weighs 1 pound 10 ounces and is 3-1/2" by 1-3/4"
It says K652-11 66-5 on one side and L65-15471-ST CRS Zephyr on the other side.

 

[Provincial]

I believe it is a bucking bar for aircraft rivets. Probably made for a specific application for an aircraft factory. I have seen bins of similar ones at Boeing Surplus in the past. I even own a few.

 

[cvairwerks]

It's a bucking bar. K652 should be the pattern and 1166-5 the exact size and weight of the bar. I believe the K series is a Douglas Aircraft design.

 

[1stkam]

Thanks for the information. Ron