Congrats on this really nice condition Heuer ! From what i read on Onthe Dash and Omegaforum the number on the back , such as 70 /112, designates year of production and number of watches.

Aug 24, 2019,05:04 AM
 

While there were very few made, it does suggests more than 100 pieces in said year i think. But the one such as in your condition is probably a less than 10 pieces survivor. So real treasure 

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Heuer 7753 - new acquisition

 
 By: cholack : August 21st, 2019-23:46
I’m proud to present to you this new acquisition of mine. It is an exceedingly rare 7753 reference but what makes this exceptionally rare it is condition. I believe that only about 20 of these have existed, and were produced specifically for the Belgium A...  

Thanks for the kind words.

 
 By: cholack : August 22nd, 2019-00:04
It was a bit of luck and chance getting this one.

Nice, I think I've never seen it.

 
 By: VMM : August 22nd, 2019-02:20
Thanks for sharing. Vte

Wow!! Congrats!

 
 By: Watcholic_id : August 22nd, 2019-06:00
stunning piece! thanks for sharing the pics here

OMG is it new?:)

 
 By: Freccero : August 22nd, 2019-07:35
There so much radium in it! Anyway, beautiful and very rare gem. P.S. Is there any writings on the caseback?

That thing is CRISP!!! [nt]

 
 By: Brandon Skinner : August 22nd, 2019-08:25

Wow, so cleeeen !

 
 By: destrodan : August 22nd, 2019-08:34
Such a great find. So beautiful! Kind regards, Dan

Congrats on this really nice condition Heuer ! From what i read on Onthe Dash and Omegaforum the number on the back , such as 70 /112, designates year of production and number of watches.

 
 By: Ron_W : August 24th, 2019-05:04
While there were very few made, it does suggests more than 100 pieces in said year i think. But the one such as in your condition is probably a less than 10 pieces survivor. So real treasure