A rare watch, and even more rare provenance (vintage Longines content)...

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Photo op outside. Lighting/background etc.

"Er, could you put the watch on the other arm please Amy?"

I did a flip, but her hairstyle suddenly changed the part from right to left.

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Hard to make out but reading the text on the casing of her sextant will make sure on the correct orientation of her photograph...
 
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Hard to make out but reading the text on the casing of her sextant will make sure on the correct orientation of her photograph...

Here is Weems showing her a drift meter and his Pocket handkerchief has not jumped ...... so I am happy with my analysis so far ;0)
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Source: https://timeandnavigation.si.edu/mu...s-teaches-amy-johnson-navigational-techniques

amy-johnson-posing-with-sextant-and-weems-watch-may-3-1937.tif_.jpg
?
U.S. BUREAU OF STANDARDS
TYPE
AIRCRAFT SEXTANT
BAUSCH & LOMB OPTICAL, CO.
?
?

edit: and the last two lines are
ROCHESTER N.Y.
Patent Applied for

Edited:
 
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The instrument she's holding in the second photo appears in the foreground of the first photo, and as others have noted, the watch seems to have been deliberately switched to her right wrist, but upside down. It's a confounding detail.

There's another watch on the desk in front of her in the first photo. The marks on that photo suggest a pretty tight crop, just barely clearing Mr. Weems's pate. @JwRosenthal 's insight would come in handy here.
Don’t know what I can offer that hasn’t been scrutinized already.

This is the correct orientation of this photo- the direction of the text on the sextant is pretty obvious when you zoom in (despite being blurry).


Looking at these images, it seems she not only switched which arm she wore her watch on, but also which side on which she parted her hair.
Was she left handed? I know several lefty’s who will switch upon which arm they wear their watch, depending on activity.
 
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2x projected high is my guess.
 
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Was she left handed? I know several lefty’s who will switch upon which arm they wear their watch, depending on activity.

In the photo with the watch on her right sleeve, the watch is upside down.

For reasons we’ll never know, seems she slapped it on the other arm with no intent of reading it - but seems likely there was some photo op staging likely to explain it.