Underground Comix are known for using different prices, covers (art or color variations) and interior content to distinguish different printings.
1st print 1969 has no cover price. Captain Guts' shirt and pants are white.
2nd-3rd prints 1971 have no cover price. Captain Guts' shirt and pants are blue (2nd-3rd prints indistinguishable)
4th print 1972 has 0.50 USD cover price. Captain Guts' shirt and pants are blue.
This issue has variants: