How do I figure out what flail mower I have

[K185farmer]

I have come into position of a flail mower that needs some parts. How do I figure out what flail mower I have? all the tags and stickers are worn off

 

[dusty3030]

Alamo / Mott

 

[Sportsman762]

It is a Mott 60 or 72. It is not a J series as they use a different gear box, nor is it a SH or SHD series as the mounting frame is different.