Which freewheel remover?
 

This freewheel is marked "Shimano 6D." Does anyone know which remover is used to remove it? I went to my LBS; they have approx. 20 freewheel and cassette removers. They don't have a match and did not have any info for me.
Does "Shimano 6D" ring any bells?
thanks. https://cimg0.ibsrv.net/gimg/bikefor...3c0b02fd99.jpg
https://cimg1.ibsrv.net/gimg/bikefor...c45b1e2763.jpg

Looks like you might have a Uniglide cassette hub there. Can you take a picture of the hub through the spokes?

Yep, a Uniglide freehub.

You'll need two chain whips, and just unscrew the small sprocket, and the rest of the sprockets should slide off.

Look for spares on E-Bay.

Is this associated with a specific group set like Shimano 600 or 105, etc? Trying to do more research on it.

So the first cog should come off clock-wise?

Counter-clockwise, with respect to the other cogs. :thumb:

Uniglide could be found at most levels before it was supplanted by Hyperglide.

Ditto. Uniglide hubs were available in every grade from Altus to Dura-Ace. I guess that's a lower-line hub because it has black cogs. If you can find markings on the barrel of the hub (something like "FH-100") we may be able to make a better guess.