The PAM671 was made by ZF and XF in versions 1 and 2.
Nothing, never heard or seen about the SF 671, nor the cheap real bronze versions, 7750 and the deco plate under the P.9010.
Honestly, I want to say that the clock in your photos looks worse to me than those ZFs that I saw before, but it's hard for me to understand if this is a specificity of the photo.
Here is a christomatic example of the comparison between ZF and XF, created by our esteemed moderator, who lost photos when viewing on RWI. You can make sure that this watch is shown there:
https://www.rwg.bz/board/index.php?/topic/130431-comparison-and-review-zf-pam671-and-xf-pam671-v2/
If your seller, claims that this is new, then considering that the PAM968 ZF was recently made, maybe they did some 671 too, but there was no information about the yut on the forum, and this is somewhat different from what was done 4-5 years ago, however, these are only guesses.
From the facts, I see here the typical shortcomings of the ZF of that time, in the form of hands and markers, and the proprietary specifics of this factory, in the form of CP with edging, but in general, although everything, of course, depends on your need for this watch and the price, I personally would skip this 671.
