Old ironhorse/rpm lawnboy needing identified!

Hey all, I'm new to this site but I've been collecting old lawnboy push mowers over the last two years or so. I was hoping someone on here could offer some insight on this recent purchase i made, hopefully the pic shows up. It says it's a model 3000 on the tag and the tag says RPM. The deck looks like some of those early LB decks that said "bell ringer" across the back but this one says lawnboy. With the tag saying rpm and the ironhorse motor I would think this is an early 50's model but I've never seen one with this type of deck and badging?? Any info is appreciated!! Thanks

Here ya' go...:

Another "drive-by" poster.
Some of us would appreciate some feedback.