Hello again everyone

I saw these photos posted on the TapaTalk Forum:

http://gallery.myff.org/gallery/782545/StirlingIV+1.jpg

http://gallery.myff.org/gallery/782551/StirlingIV+2.jpg

Can anyone tell me where they're originally from? It's not from the Stirling AP1660A/B/C/D series, as far as I can tell. I'm assuming the arrows have captions, so some other sort of manual?

Regards

Simon