Planter model?

Can anyone tell me what model this is? TIA

I’m trying to figure out what sprockets I need but not sure on model number. So was looking to get a manual but didn’t know which one to get.

OP Mans still available - that is a 72 series unit - flat chain - could be on different frams - most popular was the 600 3 bar frame. The unit was ordered with the single rib traction tread tire. The most important 'fix' is to add the Sunflower soil control strips - make your own or ben the scrapers to fit at a 90 degree to the opener - other wise in wet soil the 45 degree scraper will throw the soil out of the seed trench.  All I remember is a 10  tooth and 14 tooth came std. That yielded an 8" spacing with a 16 cell corn plate. Look at the drive axle under the unit - it is held to the correct backlash via roll pin and shim washers. Most roll pins were worn through and the gear did not mesh properly and 'stripped'  Also the tongue and roller (which wobbles and is not worn out as most think) is adjustable via set screw in hopper bottom to allow the tongue to ride on the seed plate for corn and raised up for larger cell bean plates.