I'm very sorry about your father's passing. That's never easy.
In the last year I've seen OEM CZ 52 mags priced as low as $15 each on gun show tables, and I've seen ads for $35 each that seemed way too high. My hunch is that they are worth somewhere in between.
Let's speculate a bit.... Remember, almost 100,000 CZ 52 pistols were imported into the US after the fall of the Iron Curtain. That means almost 200,000 OEM magazines came into the US, and almost all of them should still be in workable condition. If there is any artificial shortage of them, it is because some were separated from their original pistols and were sold to other buyers, which is probably how your dad ended up with four. That means three other pistol owners have only one, which generated the demand for magazines that is now being satisfied with aftermarket mags. Price competition comes from those newer mags, not from a lack of original mags.
So, the law of supply and demand rules here, which means that anything for sale is only worth what someone else will actually pay for it.
Scott
