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Yo, https://en.wikipedia.org/wiki/Sperm_whale_oil.

Also, ATF was developed to replace whale oil in automatic transmissions. Jojoba has replaced it in many applications.
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Oh it's slick, AND nearly flat all surfaces (save the chips).

Translucent for sure.

Filling in a letter or two here and there the Green Label approximately reads:

"Pike's Genuine Hard...

And it's en route! I'll report back here in a few weeks as to how it hones.

Also, there are zero other items in the sale to indicate a razor user. But there's evidence of gunsmithing and some cutlery. My guess is that this (and the other stone, yet for sale) was used to...

There's the label.

Well, it's vintage and might work for something. Reportedly an estate item from 85 year old fella. If it proves unsuitable for razors, i'll save it for fishhooks and pocket...

besides MINE? :hmmm:

I made an inquiry as to the green label in the box, but learned nothing. So i made a low-ball offer and she accepted (I don't just randomly throw lowballs, sometimes too...