RAF Wind en Navigation Calculator MKII

[Luftwaffe44]

Hi guys,
Can anyone confirm this is a ww2 example?
http://sliderulemuseum.com/HSRC/26641.jpg

Code: 6b/276

Thanks in advance,
Edgar

[lancasterman]

It appears to be a wartime one but not sure on the part number. I have seen that Air ministry Arrow on other wartime parts.