1099b box 1a "type of asset" - none of the options seem right

On the screen that says "Tell us about the sales . . .," when it asked "Do these sales include any other types of investments," you should have answered Yes. Then you would get a longer list of types, including Collectible and Other.

well that's pretty clever. I would rather call it "Other" than distort it by calling it "stock". Thanks.

Since you did not sell stock, or cryptocurrency, you would choose the "Other" option. 

When you enter the sales data, choose the Collectible option

Collectibles have a maximum federal capital gains tax rate of 28%, higher that the normal maximum capital gains rate of 20%, so it is important to get the sales category correct. You can learn more here: Investment in Collectibles

Thanks for the additional insights and the link to Investments In Collectibles.

Fortunately my investments are NOT  "collectible" because the gold is stored somewhere at the bank or a non-bank trustee.

From the link you kindly provided:

The following coins and metals are not included in the definition of “collectible” under IRC Section 408(m):

• Certain gold, silver, or platinum coins described in 31 USC Section 5112. See IRC Section 408(m)(3)(A) for the full definition.
• Any coin issued under the laws of any state.
• Any gold, silver, platinum, or palladium bullion of a certain fineness

  if a bank or approved non-bank trustee keeps physical possession of it.

  See IRC Section 408(m)(3).