Show us a “ only one that’s known of” card

[raulus]

Always hard to say with some stuff. As far as I know, I think it’s 1-of-1, but there’s a chance that there are more.

Here’s one - Alaga Syrup Mays postcard

Of course, as soon as I post one, the odds are good that someone else here will post their copy.

[raulus]

1955 Mays Exhibit with Mutoscope back.

[Cliff Bowman]

Larry, show your 1 of 1's 1966 and 1967 Pro's Pizza box lids .

[raulus]

1962 Jello Mays complete box in black cherry. A few days ago we saw a raw copy in butterscotch pudding flavor.

[raulus]

Mays 1962 Post Canadian inserts complete panel. From what I understand, these were only available in boxes of sugar crisp cereal.

[raulus]

Mays 65 Bazooka complete box.

[ValKehl]

There may be a couple more 1954 Briggs Meats 2-card panels with Mickey Vernon and Eddie Yost out there, but they won't be signed by each player:

[Cliff Bowman]

I missed the 1951 Hirsch Clothing Phil Cavarretta from the first post. The Ron Santo promo pin for the 1969 Cubs Iron Ons and the 1969 Jim Hickman Cubs Iron Ons are the only ones I have seen but there are undoubtedly more out there. I have never seen another 1974 Topps Dusty Baker print error, a few others were definitely printed but who knows if any others still exist.