Estonia - Latvia
In early 2020 I visited the border between Estonia and Latvia and photographed a few border markers, although taking pictures of border markers wasn't my hobby back then.
The border markers look quite new and are black and white poles with a "block" on top of it.
A number is clearly present on the markers. One of the markers has a confusing number "201 + 257". The reason for this number is not clear to me.