Comments:
In 2012, I had enough certitudes to jump on a Bronze Milspec which was offered to me, the Number 3221:
Indeed, I could find some interesting coincidences about case numbers.Especially in the Serial Number range from 3163 to 3248...
Blancpain Fifty Fathoms Bronze Milspecs. 14 years of investigation on case numbers
14 years since now. In fact, it took me 5 years to fully understand the Fifty Fathoms Bronze Milspec case. From 2008 to 2013... In 2008, I discovered two Bronze Milspec, an US NAVY and a " Civilian ".
Since then, I started to investigate on them, contacted all my friends collecting vintage Fifty Fathoms, sellers, and made some researches on the net to cross all the informations I could gather here and there.
There is a difference of 85 numbers, only, and there are two things I pointed out:
1/ The Serial Numbers 3163 and 3248 are both Civilian Milspecs, no Bronze case, with a 2 piece case back, which is not rare for a Milspec, BUT, more interesting, both come with drilled lugs....
Alain's marvellous specimen ( 3163 )
My " Ex " ( 3248 )
2/ More curious, the " Bronze case "...
" Bronze " is the color, not the material, to be clear.
It is certainly due to the treatment made on the sandblasted case, as pointed out by some of us ( BDLJ ) in previous posts.
I observed several of them during these 14 years of investigation, the numbers 3201, 3205, 3208, 3215, 3217, 3221, 3223, 3224, 3225, 3226, 3227, 3229, 3232, 3233,3234, 3237 and 3239. I am aware of other Bronze Milspec, the 3246, the number 3220 and the 3230
Among these twenty, five of them are US NAVY, which were part of two prestigious collections ( Nr 3226 and 3233 ), the third one ( Lot 231, Nr 3227 
has attended the Fifty Fathoms Exhibition, and the last one, the 3217, has been auctioned by Phillips at the end of the year 2015, as well as the 3237, in December 2021.
has attended the Fifty Fathoms Exhibition, and the last one, the 3217, has been auctioned by Phillips at the end of the year 2015, as well as the 3237, in December 2021.Both of them come with the small crown, sometimes with a triangular index on the bezel, at 12 o'clock, sometimes with a losange index.
Here are the pics of a few of them:
- Nr 3201 ( Credit picture: Phillips ), with a dial which belongs to another Milspec, not to a Bronze Milspec, definitely...
- Nr 3217 ( Credit picture: Phillips ) :
- Nr 3221, my Bronze Milspec, which is strictly identical to the Nrs 3205 and 3208, as show, below.
The 3221:
The 3208:
- Nr 3226 ( The Nr 3233, the Nr 3217 and 3237 are in all points identical, at the exception of the losange at 12 o clock, on the 3226, while the others have a triangle ) :
3237 ( Credit: Phillips ) :
- Nr 3223: ( The dial and the bezel are not correct, as the dial should of course be a Milspec, not a 3 / 6 / 9 / 12, the bezel should be bronze as well, not stainless steel ). The Nr 3234 and 3225 have the same incorrect dial, but with a correct triangle bezel.
3225 ( Credit Hodinkee )
A detailed view on the small crown, the long thick lugs and case back of the 3323:
- Nr 3224, seen in Konrad Knirim's reference book: A " curious " dial, while the rest of the watch is perfect.
- The Nr 3239 has been seen at the Fifty Fathoms Exhibition, too ( Lot Nr 237 ) and has a 6 / 9 / 12 + Date dial, signed " Technisub ", which cannot be the good one, for the same reason than Alain's " Bronze ". ( On the extreme right )
We compared the lugs on the no Bronze and Bronze Milspecs, to see if the cases were different or not.
The answer comes with these pictures.
No difference between a " normal " Milspec and the Bronze Milspec:
The US Navy Bronze cases came all with an AS 1361 HACKING movement, while the others housed an AS 1700 ( 1701 with date, but I already mentioned my reserve on any other dial than a Milspec, on these watches ).
The Cal AS 1700:
The only exception to this rule is the 3215, which seems to have a " normal " microbillé case, a bronze outer part of the case back, a Cal 1361, and an early Milspec dial. Curious one...
From all these observations, raises a question, or a speculation...
Were all these Bronze cases supposed to be US NAVY Milspecs?
I have a theory, here, which seemed to be confirmed by someone who knows a watchmaker who worked at Blancpain.
This may well be a small batch of watches submitted to the US Navy, after the TR 900, but which didn't pass the tests. Why, I don't know...
Maybe because they were too expensive, maybe because the US Navy had other plans, maybe because they just didn't pass the tests...
Were they? We saw that it was not the truth. We can also guess that a few of them were coming with the US Navy Dial and the AS 1361, and that, after that the US Navy passed on them, Blancpain decided to put a " civilian " dial and use an AS 1700, as it was the case for the Civilian Milspecs from this era...
This is something we'll still have to dig out, with time, luck and help from the Fifty Fathoms Community!
Best,
Nicolas.
300 K posts ! Congratulations !!! And what a post ! 🤩🤩🤩🤩 ! Thank you so much for all your work for us !
I tried to choose it carefully. And it was a good opportunity to reveal a watch I have hidden for 10 years. ;)
Damn research you have done for so many years! Congratulations for this fantastic post!
Informative, interesting and impressive! Thank's for the post and the fantastic photos!
Great research job and thanks for sharing ! This is typically a purist's worry to understand the specs of specific models :) It is part of the pleasure, you learn so many important things.
Plus the FF is an icon and highly sought after, it is important to have minimum knowledge to ensure not buying a Frankenwatch ! I will ask for your help the day I have a budget to buy one of these marvels !
That will be with great pleasure. Yes, it takes some time. There is almost no literature on this one.
I hope the answer is never found, Nicolas. The mystery . . .
. . . only adds to the legend.
😌
Is it 300k or 3M? I can't read all of the zeroes!
I knew The Post would hit like a sledgehammer... very fitting for your hard work and dedication to our shared passion.
Thank you, Dear Friend.
Thank you, Dear Friend.