Will, I'm aware of a few different models of semiautomatic pistols that were made by Iver Johnson and chambered in .25 ACP. They are as follows:
Pocket Pistol (TP Series) - chambered in either .22 LR or .25 ACP. It was double action, 3" barrel, 7-shot finger tip extension magazine, black plastic grips, fixed sights, with either a blued or matte finish. Originally produced from 1985-1986 and reintroduced 1988-1990. In excellent condition it could be worth about $125-$145. A slight premium would be added for one with a nickel finish.
AMAC-22/25 Compact - chambered in either .22 Short or .25 ACP. It was single action, 2" barrel, 5-shot magazine, checkered plastic grips, fixed sights, blued slide & matte blued frame with color-casehardened trigger. Produced from 1991-1993. In excellent condition it could be worth about $135-$165. A slight premium would be added for one with a nickel finish.
Silver Hawk - stainless steel version of the TP-series. Produced from 1990-1993. In excellent condition it could be worth about $185-$215.
Hope this helps!
Steve Mace
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After today, its all historical