[TowerTalk] Help ID'ing Rotator types

[w5kft@nts-online.net (w5kft@nts-online.net)]

        Can anyone help with identifying types of CDE-HyGain -MFJ 
rotators.  I have a group of the larger type rotators (large case with 
brake mechanism on the bottom).  These are not T2X  rotators but I 
can't tell if they are Ham-M, Ham II, Ham III or Ham IV.  Only id 
listed is that each has a four digital number stamped on the base, 

        Example.....     5-639    4-230    5-630     5-402

Need to figure out which type.........any help would be appreciated.

Bryan W5KFT