Here are three different LSF720's that I know of. LSF720 (date code 87) LSF720A (88) LSF720B (91). Other than the dust covers, handles and type of selector switch, the only difference, that I can see, is that the screws on the 720 are offset from the normal 3/8 rats, you can see it in the last to pics. So, the faceplate for the 720 can only be used on a 720 or a SF720 (reg. handle) and maybe the LSF710 (not sure). You can get a kit from Snap on to convert these to 30 tooth.
![Image](http://i390.photobucket.com/albums/oo343/snapmom/001-23_zps1e7d3062.jpg)
![Image](http://i390.photobucket.com/albums/oo343/snapmom/002-18_zpsa31e3fb8.jpg)
![Image](http://i390.photobucket.com/albums/oo343/snapmom/003-12_zpsefb34782.jpg)
![Image](http://i390.photobucket.com/albums/oo343/snapmom/004-5_zps4bcdbe8d.jpg)