Reply by Druid

I use a “branding iron” (that my wife ordered for me from Lee Valley Tools) to put my name onto projects, and I use a penny to date the piece as shown in one of my projects at . . . http://lumberjocks.com/projects/48529
A 3/4” forstner bit will create a recess which is a perfect fit for a penny. For a full set of Coin-Sized Forstner Bits try . . . http://www.leevalley.com
It’s interesting to see the various methods being listed.

-- John, British Columbia, Canada