Corinium toilet window

Can anyone tell me the size of the window including surround in the Corinium toilet please as I want to have one fitted by AS in our Bourton toilet.  It is the size which is the problem and having seen a picture of one in the Corinium, I was hoping I could have one like this fitted.  Mrs Jimmee

Can't help with the Corinium window, but it is probably a Seitz S4 available in many sizes. AS would know. see size chart here.

https://www.jacksons-camping.co.uk/seitz/replacementwindows.htm

Thank you Peter.  I am in touch with AS at the moment but it's the size that seems to be causing the problem.  I did put a question on the forum under "Putting a window in a Bourton washroom" to see if anyone had it done and had quite a bit of helpful feedback.  I said I would update everyone when I had it sorted.  AS have come up with a window 350 x 500 which would fit but looking at the photo they have sent me it's a black surround ugly looking thing and I want it to match the AS cream surround windows.  I want to have it done and for AS to do it but unless they or I can come up with a suitable window, I won't go ahead with it.  I suppose I should have added this to the original Bourton post.  Probably too late to do so now.  Jimmy (my husband) is not keen to have it done so it's important that I get it right or it will be my fault of course.  Angela

This is really helpful.  Thank you.   I think it is going to be tight on the width but I'll have another measure as I really like this window.

Isn't the black surround just the window without the blind casing, which would be larger, 393w x 531h?

On some windows is printed the size code, this is etched on the Perspex opener part