Rolex 55 endlinks, horizontal or oblique punching?

Hello everyone, I previously posted a comparison between an original 6251h and a fake. Today, I'm seeing watches listed on reputable auction houses and online stores with bracelets that, at least regarding the end pieces, raise some suspicions.
Do you know if the 55 end link mounted on the 6251h had both a horizontal (let's say in line, parallel to its length) and an oblique (let's say following the upper right lug of the end piece) stamping?
I'll post some examples of 55 end links. Can you help me understand if both types existed on the original end links?
Thanks