Russian #131 Color Shift

I believe this is the imperf Russian A9 #131 block of six. My catalogue lists a 'groundwork inverted' type. I assume the "groundwork" is the pale brown. The pale brown appears to be OK. It's the dark brown and orange that looks shifted down and to the right. Is this a common shift?

Also for the #131 it lists "vertical Lozenges of Varnish on Face. Is that the diamond type pattern? Looks kinda like a German water mark.

So this is not the "groundwork inverted" version?

Here is an interesting thread from a few years back that discusses the inverted background.

https://goscf.com/t/12645

Cjd. Thanks. I used the link that you posted in that older thread. Excellent.
It appears to be as I thought. My example is a shifted design not a background inversion.
It's funny that the orange center is spot on to the shifted design.

Irregularities are very common in this issue. I thought I had posted a scan here of a block that was absolutely atrocious, but I didn't find it. I'll see where I might have it.

There is some thought that the poorly printed examples are akin to printer's waste. Neat to have, in any event, even if they are not uncommon.

Thanks again. Yea the ones I have are in nice condition and look good. Nice to have.