afeht one of the posters several years ago posted information about the Hungarian three hole punches. I have the information he posted about which stamps have the punches (I'll post below), but can't find the information on their background. From what I recall, the post office punched the perfin in some stamps (I think two rows of stamps from the sheets) to reduce theft.
Below is the information on which stamps have the perfin.
Bill D.
HARAMASLYUKKAL (Three hole triangle punched stamps of Hungary) 1. 1916 Arato (harvesters) and parliament
 115 20f
 118 40f
 122 1K
 123 2K
 124 3K
 125 5K
 126 10K
Total 7 values 2. 1920/24 Arato(harvesters) issue;
 335 5f
 336 10f
 338 50f yellow green
 339 50f blue violet
 340 60f
 341 1K
 342 1.5K
 343 2K
 344 2.5K
 345 3K
 346 4K
 347 4.5K
 348 5K
 349 6K
 350 10K
 351 15K
 352 20K
 353 25K
 354 40K
 355 50K
 356 100K
 357 150K
 358 200K
 359 300K
Total 24 values. MNH set 2,200Ft.; hinged at 50%; and used 1,700Ft..
2. 1921/23 Parlament(Parliament) issue;
2.50K, 3.50, 10, 15, 20, 25, 30, 40, 50, 100, 400, and 500. Total 12 values. MNH set 1,200Ft.; hinged at 50%; and used 500Ft..
3. 1921/25 Madonna and Child issue;
50K, 100, 200, 500, 1,000, and 2,000. Total 6 values. MNH set 2,400Ft.; used 900Ft..
4. 1921/24 Hivatalos(Officials) issue;
10f, 20, 60, 100, 250, 350, 500, 1,000, 5K, 10, 15, 25, 50, 100, 500(grey moiré), 1,000(grey moiré), 15K on 20f, 25K on 60f, 150K on 100f, 350K on 350f, and 2,000K on 250f. Total 21 values. MNH set 2,500Ft.; hinged at 40%; and used 1,700Ft.
5. 1921/25 Porto(Postage dues) issue;
These postage due stamps are the surcharge in red harvester stamps, 1921/1925, also know as Provisional postage due stamps. The following are the only three stamps that don't have the triangle punch, all of the rest do. The three without are; 100f/15f, 500f/15f, and 3K/15f. Subtract these from the set of 24 and you have 21 with triangle punch. I also forgot to add the conversion rate from Forint to US dollar for set values given. It's 1USdollar=230 HUF(Hungarian Forint). The Hungarian Katalogue doesn't give a value for this set, figure on double the regular sets value.
6. 1915 postage due with the green background and red numerals. There is a total of 9 stamps with the 3 hole and they are as follows;10f,20,40,50,120,200,2k,5 and 50.
Total of 9 values
Total values = 100
Jimbo2.
