As noted, re EVG styli, the only 'country of manufacture' info you will find will be in a seller's listing. Pfahnstiehl lists it on the box. So for EVG, you'd be relying on the supplier giving the correct info to the seller.
There are a number of reports you can find confirming source for EVG styli. Here's an example:
http://www.vinylengine.com/turntable_forum/viewtopic.php?t=39705
Just looking at my collection, I can see a trend regarding the diameter of the cantilever, markings on the cantilever and the size and shape of the mounting surface for the shank of the needle (let's call it the 'spade' for lack of a better term - I'm sure there's one out there). The styli I have that are sold labeled JICO (from turntableneedles.com) and EVG (multiple sources) have very similar characteristics. In general Pfahnstiehl cantilevers seem to be larger diameter and the spade is subsequently wider, but also longer. EVG and JICO styli generally have some marking on them (blue or black dot). Pfahnstiehl generally not.
So:
V15III
1) EVG stylus 764-DE from Carolesneedles - box
with bar code number. Black 'dot' on bottom of cantilever near tip & 'Special Tracking' on the stylus guard.
2) EVG stylus 764-DE from Carolesneedles - box with
zeros bar code number. Same cantilever markings and stylus guard as (1)
3) Ed Saunders elliptical replacement (purchased directly, but some years ago) - red 'dot' on bottom of cantilever mid-way down and nothing on the guard. Ed Saunder's styli are made in Switzerland ... Pfahnstiehl? (that opens another debate!).
The EVG styli (1) and (2) are
absolutely identical. So that firmly, as far as I am concerned, puts to rest any issue that EVG styli with 'zero' bar codes are somehow a counterfeit product. The Ed Saunders (3) has a thicker cantilever and wider / longer spade. Differences in the molding of the body and guard too. The body is subtle. the guard is definite.
m97 styli:
4) JICO stylus 771-DHE (hyperelliptical) from Turntableneedles. Blue 'dot' on bottom of cantilever close to tip and no marking on swing-down brush/guard.
5) Pfahnstiehl 4771-DE from Voice of Music. No marking on cantilever, completely different body, guard marked N97E and no brush.
Cantilever and spade for the JICO (4) looks the same as the EVG (1) and (2). The Pfahnstiehl (5) is thicker, but not as thick as the Ed Saunders (3) and the spade looks similar.
V15IV stylus:
JICO 772-DE from Turntableneedles. Black 'dot' on bottom of cantilever near tip and no markings on guard/brush.
The cantilever and spade on this stylus looks exactly like the EVG (1), (2) and the JICO (4).
m91 stylus:
6) EVG PM3136DE stylus from Stereoneedleslady. Black dot and same cantilever characteristic as (1), (2) & (4).
Too bad I don't have my Tonar (Nagaoka) m91 stylus anymore to compare (oops ... there's another debate!).
Final thought - I don't think you'll find a marking on the cantilever of a conical stylus, regardless of manufacturer. The EVG and Pfahnstiehl styli I have for non-Shure cartridges certainly don't.