The regular types are distinguished as follows:
Type 1, applied with a horizontal handstamp of 5 clichés to kopeck values. Fourteen different handstamps can be distinguished
Type 2, applied with a vertical handstamp of 3 clichés to rouble value stamps. Three different handstamps can be distinguished
Type 3, larger than 1 or 2, applied with a vertical handstamp of 3 clichés to rouble value stamps. Three different handstamps can be distinguished.
The basic research for this classification was done by Dr Seichter using complete sheets (which are in my possession now).
Both Dr Seichter and John Bulat distinguish Reprint [Neudruck] material, all of it supposedly ordered by the Riga stamp dealer Dzenis at the time in early 1919 when both Riga and Kharkov were under Soviet control and communication possible. It seems to me unlikely that one dealer was responsible for a very large quantity of Reprints and others may have been involved. The Reprints were postally valid and so might be regarded as later printings rather than Reprints.. Both Seichter and Bulat think the Reprints can be distinguished visually by the ink used. Except where the Reprints are made in violet ink, I do not think this claim is true as I have argued in previous Blogs ( See my Blog of 20 December 2011)
Types 4, 5, 6, 7 and 8 are "local" types made from single handstamps and using inks which are generally distinguishable from that used for the main body of overprinted stamps. I no longer have any examples of Type 8 (the "Lubotin" type: see my Blog of 28 July 2010) but this is what I have for the others. This collection is for sale. Click on Images to Magnify: