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Ok, thanks for the photos, it’s not a Hindostane, it would have a layered look on the sides, looks more like a Dalamor and not an Ark.

When you lapped it, how hard is it, and what did you lap it...

Can you take some close-up photos of the sides?

Some oven cleaner from the Dollar store, then soaking in Simple Green or Awesome, degreaser will clean it further, may take a few days.

If it is...

See if they will let you scrape a bid off the side with a knife tip. The color and softness may give you a hint. Tell them if you damage it, you will buy it, you won’t.

The large one could be an...