Dateless Buffalo Nickels

I was at the Greater Biloxi Coin Show last weekend (March 20th).

While there, I looked for wheat pennies to add to my collection. There was a nice guy that I met who I bought a 1917S and a 1927S from. He asked me if I collected Buffalo nickels. I said that I have a small collection. He asked the person with him at his table to give me two Eisenhower dollars and some Buffalo nickels in change. He gave me nine dateless Buffalo nickels and a 1944P Jefferson nickel.

Two of the nickels, I could sort of make out dates (1923S and 1924). The other seven, I had no idea.

I poured some distilled white vinegar into a cup and put a few of the nickels in it. Less than ten minutes later, I had a date - one of the nickels was 1918.

I started putting more of them into the vinegar. Over the next three or four days, I got these dates:
1920
1925D
1937

By the fifth day, I had only three nickels left. I pulled out a 1924 before I left that morning, leaving the other two in the vinegar.

When I got home, I took good looks at the two remaining nickels. One of them was another 1918.

And the other was a 1913 Raised Ground Variety.

I don't know what the mintmark is, as the entire FIVE CENTS is rubbed out. The vinegar only brought out a faint outline, and I think it's a 1913D Variety 1. But I don't feel like putting it back into vinegar (all of the luster is gone ), so it's staying in the 1913 Variety 1 slot.

Now I want to buy some Dateless Buffalo nickels.