Caveat: I’m always suspicious of measurements that are exactly a whole number — seems wildly unlikely.
There are at least two different designs of indicator rings and how they mesh with the crystal and the bezel. The one in the auction is a later design. I’m not up on the exact differences. Hopefully someone who is will chime in.
No, different size. Thanks for posting though as I'm back and had forgotten.
I have two spare Guide pointer rings. Both are the later style with a "house" pointer and a "stepped" outer edge. I believe earlier pointers have a bevelled outer edge instead. When the retaining method changed, I do not know. I also do not know if it was done at the same time as when the pointer was changed from triangular to house style. While I have watches with the earlier rings, I'm not wildly excited about taking them apart just to measure. They are fragile after all.
I know one of the spare rings I have is aftermarket production, perhaps even both. They are different. They are fragile and precise measurements with a caliper are not easily done. Here's what I have: