Gillette Tech Square vs Triangular
In a post on shavemyace.com I was very adamant that the geometry of the heads in the Tech series didnt change, but its well know the base plate had two variations, so I decided to take some pics.
(Largs pics after the jump)
The baseplate on the right with the square guard slots is from a British Tech, no date code, the triangular slots is from a 1939 USA Tech
You can see the triangular slots are smaller and come close to the safety bar,
Top of my hand, British Tech, bottom USA 1939 Tech.
A blade installed in the USA tech mostly covers any gap that you can see.
I dont know if you could count one as more aggressive than the other, shave wise.