KGV Watermark Varieties - Advice Please

Here are some KGV stamps with watermark varieties.



The 1/2d Downey Head (Die 1) has an inverted watermark, and the other three sideface stamps have their watermarks sideways (Wmk 35).

My Scott catalog acknowledges some KGV stamps without watermarks and some with sideways watermarks, but does not include these.
Given that I have an SG catalog for Australia, I know that SG has detailed info and values for these (and one day I hope to have one).

I am wondering, what are the values of these stamps. Especially given that the three side-face KGV stamps are not entirely sound.

Many thanks for your expert advice.

smauggie, this is the snippet from the beginning of the KGV section of Great Britain in SG British Empire:

Smauggie, this is from the general info at the beginning of the SG Specialised Vol 2 (KEVII, KGV and KEVIII). It pretty much says the same as above.

Thanks guys. As usual the answer is more complex than I was expecting. Always good to have the mind broadened. Great info!