I bought a 206 industrial on eBay last week. It's a centenary and didn't come with a manual. I'm very well versed with 306s, 319s and 320s and could have found my way around a domestic 206 but this machine is one of the industrials. Here's where my ignorance will be obvious: It has that extra lever setup at the back. I need a manual for this particular model, since some of the extra industrial bits are disassembled.
Serial number is EF964835.
If this message seems familiar, I also posted it on the vintage singer group
Here are two pics:
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