I'd reach out to them at the support line. I had one, and started with the model 500 and it was on the id plate, however after I upgraded it to a model 510 by getting the bigger support tables and a few other things. So a model is not necesarily the base unit. They are pretty good. I had mine for quite some time. Still whish i had it for a horizontal drill machine.
Easy answer is go to the ShopSmith forum. There is a wealth of knowledge there.
Here are some quick guidelines.
If the power head is cast iron, it is a 10E or 10ER, pre1954
If the fence clamps to a steel profiled bar on the saw table, it is a 500
If the fence clamps to chrome pipes attached to the saw table, it is a 510
If the fence clamps to an aluminium extrusion attached to the saw table, it is a 520
If it tilts at both ends, it is a mark seven of which there are two, the older no longer supported by SS and the newer the flagship of the new PowerPro line.
That said SS has all kinds of upgrades available so there are many "hybrids" like a 500 upgraded to 510 or 520.
You can find out the exact date of manufacture from serial number and that will tell you most of what you need to know.
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