Definetly going for modern now, I took a look at the website, their current logo is the same and the chunky soles are a feature on many of their current shoes. Sorry! Being marked with the country of original is also a modern feature, though I don't know when/if this became a requirement. Many modern shoes are being made in the country the leather comes from such as Brazil or Spain.
Just thought another difference between 70's and later copies is the font colour on 70's shoes is nearly always stamped in a contrast ink like gold, silver or black on a lighter background, they really wanted it to stand out, rather than tonal shades as they do now.