Real McCoys Japan, mixed batch B3/Werber/Phillips Tanning

Just bought this jacket from the far East. Grubby fleece(soot ?) but all the belts are unused. It could be an amateurish attempt at ageing.
Specs,
Seal sheepskin with dense yellow fleece, probably Fenland.
Caramel coloured belt and throat straps
Redskin wind flap and cuffs.
Tight cuffs !
Real McCoys made these Some years ago and they are hard to find, this one is a large size 40 but a size 42 would be better for me.

Measurements please

Edit: sorry, thought I was in the classifieds!

Is it a two panel back?

3 panel.