I'm no expert on these models, but it appears to be original, and the dial is very cool and uncommon:

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*re: "chorine" m#^$#rf^#$@*ng autocorrect!

 

Was it supposed to say "chronograph"?

 

A neat dial indeed with those Paul Newman style subdials (dial by Singer?) and the interesting tachymeter scale. Any thoughts as to what those 57km/h to 42km/h indices are for?

 

I had written "chorine" – there it did it again!

"chrono"

Thanks for the edit! Or is that edict...

 

Road rallying?

 

They seem to have just offset the scale a bit, to cover lower speeds. Maybe it's for zero g?

EDIT: Was too tired before. Yes, that red part is strange.

 

No primero!

...... dammit - "problemo".

( )

 

Bezel is out of alignment. Did they have a rotating inner bezel?

 

Would you believe that the tachymeter scale on this watch is a water skiing slalom scale? Talk about specialization....

Here's a link to a site with some Longines catalog images that validates the tachy scale's purpose: http://www.sometimeago.com/longines-chronograph-ultra-chron/

 

Wow, that is too cool. Fantastic research!

 

I guessed zero g, so what do I win?