What do you mean by "detailed?" I say because you've incandescently proven that you know very little, if anything, about the underlying subject matter here. What you deride as a "Mauser owner's manual" is the underlying knowledge required to understand what would differentiate a Mauser from another rifle. You simply don't have that knowledge. Otherwise you wouldn't have made the comment about the Mauser "clip" having a window.
What I know is completely irrelevant. Weitzman said he saw a Mauser with a 5 shot clip. It's not my job to explain how he determined that, just as it's not your job to decide that he didn't really see what he claimed to see.
a 7.65 caliber Mauser bolt-action rifle,
All you need to know to figure out the caliber is to see the single stack magazine hanging down in front of the trigger guard and assume the rifle is a Mauser to expect it to be a 7.65
Bull. You can't determine the caliber of a rifle by glancing at its trigger guard.
which loads from a five shot clip which is locked on the underside of the receiver forward of the trigger guard.
As I've said before, "locked on the underside of the receiver" either refers to and en block clip or to the magazine itself. An en block clip would eliminate any Mauser, but not the Carcano.
That also doesn't matter. You don't know what Weitzman knew or didn't know about the design of the Mauser. He's describing what he
saw, not what he knows about how Mausers are built.
What's the point of mentioning a 5-shot clip that he never really saw?
As for the five shot part, we just went thought that, and you didn't come out of that too well. There's no simple way to directly determine the magazine capacity on those old bolt action rifles other than to load them until you can't while counting the rounds you put in.
Then take it up with Weitzman. He's the one who said the rifle he examined had a 5-shot clip.
The universal shortcut is simply to know how many rounds a particular model rifle will hold beforehand and work backwards via syllogistic logic.
They didn't ask him how many rounds a Mauser holds. They asked him to describe what he saw.
the rear portion of the bolt was visibly worn.
Would be true for either a Carcano or a Mauser
Show me the visible wear on the CE139 bolt.
The wooden portions of this rifle were a dark brown in color and of rough wood apparently having been used or damaged to a considerable extent.
Dark brown wood of rough and well-used appearance wouldn't be exactly unexpected on a surplus rifle, no matter the make or origin.
Show me the dark brown rough damaged wood on CE139.
The rifle was equipped with a four power 18 scope of apparent Japanese manufacture.
As I've already pointed out, this information appears conspicuously on CE139's scope in nice, white letters on a black background for easy reading. Unlike the metal-on-metal stamped and etched text on the rifle itself. Anyway, this is the scope rather than the rifle itself.
The fact remains that CE139 is stamped "Made in Italy" and "6.5". You don't just get to decide what Weitzman could see easily and what he could not.
It was also equipped with a thick brown-black leather bandolier type sling
And I have yet to see how you would use the sling to tell what make a rifle is. Maybe you can elucidate us on that.
Does CE139 have a thick brown-black leather bandolier type sling?
In the end, there's nothing in Weitzman's "detailed" description that would prove that he saw a Mauser.
There's nothing in Weitzman's detailed description that would prove that he saw CE139.
