Agree, I think Longines have done a good job with their heritage line. This one has just come back from service, it’s running well and is such a good fit for me
About 35mm. I have the same watch with a more “tropical” dial:
gatorcpa
Lovely one... And our resident expert is as usual correct, 35mm 😀
Case wise, a bit beefier than the subsequent Conquest ones. See below my All Guard with Mr. @iamvr 's Conquest black dial ( yeah, he's thinking about gifting it to me 😀 )