1934 Upside Down Switzerland MT Pilatus /3 Attached Stamps

Can anyone tell me if this is an upside down stamp or inverted stamp,and what is the stamp or whatever that is in the middle??

Correct me if I'm wrong: a tete-beche pair with the gutter.

Don't know about the gutter, but a tete-beche pair is listed in my scott as #228a worth 30 cents.

This is what the Swiss-Germans call a zwischensteg. In the 1997 SBK Catalog (Swiss Specialized), it is #S50y (plain gum) or #S50z (grilled gum), cataloging 2.50 or 10 Swiss francs respectively, used. Grilled gum leaves a very fine mesh impression on the used stamp.

Strictly speaking, this is not a tete-beche pair, as there is a decorated gutter (kreuzreihen) between the stamps; tete-beche pairs are cataloged in a separate section of the SBK, #K32y/z, at a lower price, 1.20 Swiss francs for the pair.

I think the term is tete-beche interspace pair.
I don't know the actual year of those stamps but there were at least two similar printings in the mid-thirties.

Scotzm the year of the stamps is 1934 I believe

Nice to learn something new scotzm

There are some se-tenants from the 1949 set too.

The 5 C., 10 C., and 20 C. denominations were each issued in booklets containing 10 panes of 8 stamps. Unexploded booklets are very expensive. As these Swiss stamps were printed in a special sheet format (nine vertical rows) for use in creating booklet panes, they all exist in tête-bêche and inter-space pairs.

"Scotzm the year of the stamps is 1934 I believe" said UFOAIRMAIL but that could be correct or wrong as I think there are two (at least) printings with the value in different positions.
Anyway... they might be a bit "rarer" than normal tete-beche.

The two stamps that started this thread are from 1938. There are two varieties, one with two and one with three zig-zag lines in-between.
The Zumstein catalog calls these "Zwischenstege" as opposed to the "tete-beche" Technik und Wirtschaft booklet stamps, that are "Kehrdrucke" in same catalog.

Peter

As I noted above, in the SBK Swiss Specialized Catalog, there are only TWO "zwischensteg" pairs like the OP's -- #S50y and #S50z (17 Sep 38), the first is plain gum, and the second is grilled gum. And if you order a tete-beche pair from a Swiss or German dealer, you will NOT get the 3-part item shown by the OP; you will get two stamps adjacent to each other, head to foot.

The second printing of this stamp (1 Dec 42) has a zwischensteg with THREE zigzag lines instead of two. A single 1942 stamp, unattached, is probably indistinguishable from the 1938 stamp; SBK doesn't mention any differences.