I try again my luck (Literal translation !).
About this (Krag ?) postmark :
http://cjoint.com/14fe/DBlvJptqc27.htm
Six bars are mentioned in the "collect british postmarks" 7th edition, but here are five...

Krag -=straight line=- cancels come in 5, 6 and 7 bars.
The 7 bar is the first trial and is 17.5 mm high. Two are 18.5 mm
high, a 5 bar and a 6 bar. There are also 19 mm and 20 mm 6 bar Krag
cancels.

So a total of 5 types for the -=straight line=- type.

There's also 4 wavy line types, all with 5 lines.

HTH!