I’ve had both an original Friesland/Melitta Utah Teapot and the ~2017 reissue.

The interiors differ between the original and the reissue. The latter has an integrated ceramic strainer near the spout root not present on these models updated interior geometry.

This listing appears to show a “vintage” teapot with the strainer on photo 8 - so I guess the plot steepens: https://www.ricardo.ch/de/a/melitta-friesland-minden-teekann...