Czechoslovakia - Still popular in Philately:
Recently, obtained issue from this country, under topic of "Poisonous Mushrooms", with really PERFECT design, engraved, with quality of print, that is today available just in few countries worldwide!
Probably, one previous issue from 1958 year is better made, this one is not behind it and well "fit" in every specialized collection.
Here it is:
Year of issue 1989, in Michel catalog number have it under number 3017-3021, with affordable 4.00 euro catalog value.
Scott catalog list it under number 2758-2762, with catalog value per full set of 3.15 US$.
Stampworld catalog, which I admire as most "neutral" for market prices, have this set listed under number 3014-3018 with 3.51 US$ per set, in mnh quality.
If we want to see, what is real price on market, we can check it on eBay, where You will discover one really low price for set, which is around 2.00 US$ per one, but You will need to pay for postage, and probably PayPal fees, so price will be exactly as Stampworld say.
Now, if You want to see this issue in full beauty, You will need it is sheets of 10 stamps, which Scott catalog mention and value at 40.00 US$, Michel catalog is little bit more in price for same sheet of 10, it have 50.00 euro per set of 5. Next one option is listed in Michel catalog, but not mentioned in Scott, and it is that two values from set, are issued in sheet of 4, where Michel catalog for this two values (50 h and 3 K) have catalog value of 200.00 euro.
Expensive, but worth to have in this sheet option, especially, that on market, this sheets are no frequently available, and when it is available, it don't go down with price!
Enjoy!