cal 51010 and 51011

good afternoon folks,

I have two questions:

1) can someone tell me the difference between an 510010 and a 51011?

2) which one is (or will be) in the future be considered as being the ´most collectable´ one?

Be reading

tx
Peter

Do an archives search for more info (more)

Click on the link at the top of the page "Search forum and archive" and enter 51010 or 51011 in the message section. There are several posts on this subject there.

Hope this helps

Bill

cal 51010 and 51011

This was discussed in some posts below. Scroll down a few pages and you will see it.

Mistery solved !!!

I have been asking your question number 1 for a few day and finally find an answear from a message of MF:

"Portuguese Automatics and the 42 jewel mystery...

I obtained some interesting information about why the movements in some Portuguese Automatics have 42 rather than 44 jewels. In the course of obtaining this information, I learned more than a few things about the history of Cal. 5xxxxx movements.
What follows is an unofficial report from an executive at IWC, which I have edited and slightly rewritten:
IWC’s calibre 5xxxx movements IWC have had several modifications over the last 7 years.
The movements from the first stage of development have calibre numbers with 4 digits (cal. 5000, cal. 5011).
Then modifications were done with the design of the automatic bridge. Those movements have calibre numbers with 5 digits (cal. 50xxx).
The third development stage was modification of the oscillating system (3 Hertz Balance with excenter-regulation). Those movements have 5-digit calibre-numbers which start with the numbers 51xxx.
The most recent development stage was done in 2007. The cogging of the complete wheelwork was modified. A smaller modification also was done to the bearings of the barrel: instead of the rubies, IWC now uses beryllium bronze bearings there. Therefore, the new movements have two rubies less than the older movements.
Therefore, reference 5001, the Portuguese Automatic, has been made with three movements:
--cal. 50010 => 2.5 Hertz movement, 44 rubies
--cal. 51010 => 3.0 Hertz movement, 44 rubies
--cal. 51011 => 3.0 Hertz movement, modified cogging, 42 rubies"

About question number 2, I think that 51010 is the second version of the movement and is not produced any more since 2007 (so now there is a limited existance of this movements), while 51011 is on production and incresing its existances until who nows when.

Saluti,
M

Mistery solved !!!

Mateo,

thanks a lot.
Peter