I have a letter and number stamp set,3/32 of an inch size,that I use for my first initial,last name and the year.I also use a hot stamp that I engraved an 'H'into.I have been doing this for a couple of years now thanks to my wifes constant reminder which is okay as I have been known to forget on occasion.I wish the old hand made tools I have were at least dated.I'm sure some of my hammers and tongs will be around in a hundred years for someone to say'Hey,I've got a Hansl hammer made in 2010!'I hope they will enjoy my tools as much as I do making them.