Picked it up off Craigslist for $400. I don't know much about it other than it's a commercial model. It functions fine, just need some blade and bedknife work as far as I can tell.
Any know how I can find out of old it is?
Looks like it should be a decent mower for your purposes.
Are you sure it's a commercial model? Looks more like a home model to me, but hard to tell with a single picture. The Honda GC was the default engine on the Home models, while the Commercial models usually had the GX Honda. However, some Commercials also came with the GC engine.
Only way to tell for sure is to find the builders tag from Tru-Cut on the mower. If the model number begins H20-XXX it is a Home model; P20-XXX means Professional, and C20 or C21 means Commercial. There isn't much difference between Professional and Commercial. The Home model uses die-cast gears in the differential and in the clutch plates. The high end use machined steel.
As for the age, you'll have to rely on the serial numbers of the Honda, and assume it was the original engine. There is no information regarding age to be found on the Tru-Cut label.
Ah. I thought the home model had belts instead of chains. You're right, it's probably a home model. Oh well. It still works fine. It just needs a reel and bedknife sharpening and the chain guard is missing.
I wouldn't sweat the primary chain guard. The reel chain is more important to be covered for safety purposes. As for Home model, I wasn't bashing your mower. It's still a good, competent machine. Keep up with maintenance, and it should last you 15 or 20 years. If you don't have a grease gun for the zerks, get one from Pep Boys or someplace similar.