I used three tools...

tool 1. 1/2" Dia 2flute for the initial outline and first rough
tool 2. 1/4" Dia 2flute for a secondary roughing path
tool 3. 1/8" Dia 4flute ball endmill to finish/engrave surface wrapped letters

The times for each where roughly...
tool 1. about 5 minutes
tool 2. about 5 minutes
tool 3. 1 hour and ten minutes @ 6000rpm and 6000*4*0.001 = 24ipm

This was a one off gov job so I was'nt to interested in a perfectly optimised speed and feed scenario - what I wanted was a super finish - and I got it!
This was right before the finish cut: