Omega Speedmaster Mark 4.5 Caliber 1045

mrsnak · 2010-04-20T17:59:45Z

Discover the Omega Speedmaster Mark 4.5 with Caliber 1045. Explore its unique case, bracelet, and historical significance in the Speedmaster Mark series.

mrsnak

WPS member · Omega forum

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mrsnak shares his journey into collecting Omega's Speedmaster Mark series, celebrating a recent acquisition: a Mark 4.5 with a Caliber 1045 movement. His post highlights the unique cushion case design and the distinctive 'case within a case' construction, inviting fellow collectors to appreciate these often-overlooked Speedmaster variations.

Was never a fan of just collecting one model of watch, but the Omega Speedmaster has a rich history of fine variations.
I have a Speedy Pro and one regular "moon watch" was fine for me, but then there are the great variations in the Mark series.

Managed to get a Mark II a couple years ago, which planted a seed to get the others.

Found myself a very nice Mark 4.5 last week, and have been enjoying this ever since it arrived. 1045 movement and that beefy cushion case design does it for me. Nice original condition. I'll probably keep it as such.

For those who may not know, the movement rests in a case within a case -you can pop the inner case down & out from the outer case. Same design as some of the Cosmic 2000s (I have 2 of those). Crystal does appear to have been turned slightly, which is why the Tachymetre markings appear rotated slightly - it's imprinted on the glass.
This and a service are in the near future.

Next on my list is a nice Mark III. Dr. No & I saw a couple on Sunday at the NAWCC event we attended. Need to get the watch fund revitalized first

This message has been edited by mrsnak on 2010-04-20 18:22:10

Key Points from the Discussion

The Omega Speedmaster Mark 4.5 features a Caliber 1045 movement and a unique 'case within a case' design, where the inner movement case can be removed from the outer cushion case.
The Mark 4.5 is one of the few Speedmasters to feature a Seamaster-engraved caseback, which is original and correct for this model.
The tachymeter markings are imprinted on the crystal, and a slight rotation of the crystal can cause them to appear misaligned.
The Mark 4.5 is considered a highly wearable watch, offering a compelling alternative to other Speedmaster models like the Speedy 125.
The original poster's Mark 4.5 came with an early 1162 bracelet, identified by screw links and the '1162' marking without the later '/172' suffix.
For crystal replacement or service, it is crucial to use a watchmaker equipped with the proper press for installing these specific crystals.

The Discussion

G99

Apr 21, 2010

it may not be cosc like the speedy 125 but having owned both this is a far more wearable watch and yet again is one you could have as your only watch. congratulations on your purchase. you should enjoy it for many years to come. best Graham

mrsnak

Apr 21, 2010

...that this came with an early 1162 bracelet- has screw links. and is only marked with 1162, not the later 1162/172. Question, maybe you can help me. I think the caseback may have been replaced - it has what I thought to be the later replacement that says "Seamaster". I know the Mark II & III had a lightly engraved Speedmaster logo, but I think these cases were slightly different, too. Original to the watch or not?

G99

Apr 21, 2010

the caseback is totally correct mrsnak as is the bracelet, its one of the only speedmasters which has a seamaster caseback. there is an article about it on chuck's site. you've got a good watch there in original condition. best Graham

Dr No

Apr 21, 2010

. . . is that I get to see his new Omegas before anyone else! One precautionary note: make sure the watchmaker that gets the job has the press to install crystals - getting them out is one thing, but putting them in is another. Regarding last weekend's NAWCC event in our locale, there were a couple of highly desirable Omegas on display, including a 911 Flightmaster with cadmium yellow hands. There was also an exquisite UG chronometer that would've made it to my wrist if there was enough loose ch

Dr No

Apr 21, 2010

. . . of a UG cal 218 chronometer rated micro-rotor movement . . . . . . and the square case 18K watch: It appears to be in good condition . . . cordially, Art

mrsnak

Apr 21, 2010

The rest in the box weren't too shabby, either. BTW- Crying shame that Art decided to pass on that UG. Movement so clean you could eat off of it. This message has been edited by mrsnak on 2010-04-21 09:16:41 This message has been edited by mrsnak on 2010-04-21 09:25:09

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