There have been others with S.T. dials but with the "Centenary" underneath.. These are later Ref 910A watches to celebrate the centenary of Samual Taylor P/L an Australian soap/deodorant manufacturer. The watch you have does not appear to be one of these, but as Catherine says likely a customer watch.

Samual Taylor had a series of brash "Uncle Sam" advertisments before being taken over by I think Giliette.

Sorry I can't help futher.

I'm off travelling again.

Cheers from the cellar

Hi Elton

I've added 2019, but I don't have the later catalogues

IWC Catalogues in PDF
format

Cheers from the cellar

From the 1972 catalogue.

Cheers from the cellar

Welcome to the Forum

I suspect it could be a Ref 3072

Ref 3072

Cheers from the cellar

The watch appears in the early 1940's Blue
catalogue
with a list price in July 1941 of 135 francs in stainless steel or 330 francs
in gold.

Cheers from the cellar

A very early snippet from testing and most probably MF's first post 1 June
2001, titled

"Nice to be here"

Cheers from the cellar

Hi Gary,

The difference is the collet used, see;

For you techies --about IWC collets...

B" doesn't mean hacking
(more)

If you want to see how the hairsping attaches to the collet, see;

Hairspring Week: Vibrating the
Spring

Hope this helps.

Cheers from the cellar

Hi Larry,

MM Henry's data base is no longer available. It used to be in the Internet
Wayback Machine but I cannot find it there anymore.

Finally found it;

web.archive.org/web/20150730204740/http://www.time514.com/MarkX.htm

Cheers from the cellar

Your watch would appear to be a Ref 8211 with a calibre 1857 movement.

Cheers from the cellar

Hi Ralph,

I'd reply as follows:

Dear X,

I have recently narrowed my collection and decided to no longer collect those
with military markings.

In light of the above I do have a spare barrel for an IWC Calibre 56 for sale.

Kind Regards.

Enjoy the festive season.

Cheers from the cellar

Suspect the case is from D Shackman & Sons NOT David Sutton & Sons

www.silvermakersmarks.co.uk/Makers/London-DS-
DZ.html

Note no Dot after the final S

Some details of the firm can be found on the following link

www.vintage-watches-collection.com/watch/omega-watch/omega-gold-with- box-and-papers-1974/

Cheers from the cellar

Maybe a Japanese Isomura platinum case, Japanese platinum case in
the50's-60's

As Ralph said it would be interesting to see to whom IWC sold the movement,
and if indeed it was Isomura

Cheers from the cellar

Probably not a Ref 9610. The Ref 9321 and its quartz equivalent, the Ref 9610
have hidden lugs, unlike yours which are clearly visible.

I suspect it is the gold version of the Ref 3804 with a different dial.

Cheers from the
cellar

Hi Dan,

Others have been posted in the archives;

Original?

The case filler around the calibre 87 movement you have shown has definite
machine/file marks that are less than professional. Combined with the dial I
suspect it has been "reconstructed".

For the curious it is worth clicking on the "Cal.87 in a round case" in the
archive post above to see the watch dial. The watch movement is marked "HXB",
an American import mark and the case shown marked D&A for the Brooklyn based
case manufacturers , DiVincenzo & Arienti who did a lot of work for
Omega.
A US import that was not cased by Cresarrow.

Unless the cases have IWC marks I strongly suspect they joined with the
movement elsewhere.

Cheers from the celler

The following post from thirteen years ago,

Seeking ref 1828 dealer sheet or information

had the dealer sheet and the image is sadly no longer available.

I've reposted it below

Cheers from the cellar

Look like a Reference 521, please see this archived post;

www.iwc.com/forum/en/discussion/47683/?page=1#post_378335

Cheers from the cellar

The 2004 IWC Dealers Workbook states packaging number 37 (what you have shown in image one) as correct for the Ref 3756 GST Perpetual Calendar.

I don't have later workbooks to know of there was any change in packaging.

Cheers from the cellar

Hi Laura,

Sorry the watch is not an IWC, the movement appears to be a Rotary Calibre 450 as depicted in La Classification Horlogere 1939

And a comparision

Stauffer, who owned the Peerless trademark were no longer the IWC distributors for the UK sometime before 1936 as shown in this cover of "Watch and Clock Maker" - September 1936

Note the Stauffer advertisment at the top and the Edwin Harrop/IWC advertisment further down to the left.

A very nice watch to keep in the family.

Hope this helps.

Cheers from the cellar