What makes you say that,
Chuck? I know you're a big fan of the 5100, but what makes
you say this would be an "upgrade?"
- The typical assortment
of reasons, some rational others not so much so...
- I may well be
mistaken, but don't many consider the 5100 inferior to
the 7750? Please feel free to tell me exactly how wrong
and foolish I am.
- Only the dim, goofy,
ignorant and/or certifiably insane... Whoops! sorry
but you did say to tell you exactly... =) Really, I
am only kidding 7750 lovers out there. It's a fine
chronograph movement. I own a number of them myself
and I do like the movement. I just like the Lemania
In all seriousness I
have some strong reasons for preferring the Lemania
5100 movement even though I am also a big fan of
the Valjoux 7750 and also a big collector of them
Some of the reasons I
prefer the 5100 include:
- The 5100 is the only
chronograph movement that, because of its
construction, can withstand high shocks without the
sweep secondhand stopping, as the chronograph
functions are powered directly.
- I'm not 100%
certain (I learned this from a 1999 issue of
Chrono's Magazine that was quoted in a post here
on TZ....) as Lemania has come out with a new
movement that is similar to the 5100 but has a
more conventional Tri-Compax layout that also
may share this feature.
- It can withstand
vertical acceleration of up to 7 g, without the
accuracy decreasing noticeably.
- Its robustness is
also legendary, the movement forgives hard blows
and has very few claims for servicing. I have heard
the 5100 likened to the Soviet T-34 tank or the
AK-47 in terms of being able to take abuse and
still function properly...
- Its extraordinary
accuracy is consistent over a long period and
the intervals between required servicing are
long, 4-7 years are usually quoted.
- It is or at has been
used by a large variety of manufacturers
including:, Sinn, Bell&Ross, Fortis, Tutima,
Alain Silberstein, Paul Picot, Orfina-Porsche
Design, Hamilton, Tourneau, Heuer, TAG-Heuer, Revue
Thommen among others.
- It has been in
continuous production for over 25 years parts
availability is not an issue and likely never will
become an issue.
- Then there is the
- The 5100 has more
features than the base 7750. You typically see more
5100's with the full Day-Date Treatment than you do
with 7750's. You also have a 24-hour military time
subdial which you typically only see on 7751
variants of the 7750 (which typically cost more.
Even though there is a
special 24/GMT version of the
7750 that has
been available to firms who wish to encorporate it
in their product line for a number of years:
- I also prefer the
layout of the 5100's dial... An Illustration from
Classic # 321
- You'll notice that
the main difference between the two is that while
the Valjoux uses two of the three sub registers for
Chronograph functions the Lemania moves the
Chronograph Minute hand to the "SST" on the main
pinion. This allows for a much larger and hence
more visible and easier to read under duress hand.
- Another observation
that I have made on my examples is that while
Lemania c.321's and c.861's as well as Valjoux 7750
and Valjoux c.72 seem to be susceptible to "Chrono
Hour Creep". I have yet to see a Lemania 5100 (or
1342 as used for Omega c.1041 and c.1040 movements)
exhibit this behaviour.
- That's most of it. I
like Valjoux 7750's... Some of my favorite watches
are 7750's: Gallet Black PVD, Porsche Design IWC
(Both Titanium and Delryn bracelet model's), Heuer
Pasadena, and of course the Omega Seamaster
Professional Chronograph... But I just really like
the 5100's better.
- The best car analogy
I can find is the Valjoux 7750 and the Lemania 5100
are the Chevy 350 and the Ford 351-C of watches.
Both are tried and true designs, nigh bulletproof
when treated with a modicum of care, with
outstanding parts availabilty and as common as
dirt. It is really hard to go wrong in a major way
with either one, but some applications are better
suited for one over the other. For example, if you
wanted to stick either into a Jaguar XKE (just for
fun and to shock the hell out of the Cobra Crowd),
you'll find the Ford 351c is a much easier
conversion because it is about 1-3 inches narrower
where there is the tightest clearance around the
fuel pump... Because the Jag has such a long snout
the frame rails get in the way. However, on a
Datsun Z-240/260/280 this isn't a problem, and the
Chevy has slightly easier parts availability... I
mean when cut I bleed Ford Blue and Silver so I'd
want a 351c in either, but I think you get my
meaning and analogy...