Those numbers are 5 604 (space between the 5 and 604) and are the only thing on the base.There is nothing on the outside of the base cover which is the brake and nothing on the bell. It appears to be
Then it's a HAM-V (Ham 5). Updated HAM IV IIRC, the full "decode" is HAM 5 manufactured June 2004. 73, ... Joe, W4TV _______________________________________________ _________________________________