Here is my 145.022-76 with decimal fitted
So some interesting information about these bezels I've gathered on my research, they were fitted and still available as optional extras to your speedy, dealers stocked them (which is a known known).
From what I can find the original decimal bezel (larger gap between the numbers and thinner quarter markers) was available until circa 1970, when it seems the design switched over to what we now know as the service bezel.
I'm compiling some evidence at the moment to support this. Why you ask? Who knows, same reason that the the dn90 changed to dnn90?? Different manufacturer?? Not sure
There are actually three variations of the bezel I can find:
Version 1: The original one (easily identified if you look closely by the spacing between the numbers, especially between 7 and 0 and 5 and 0 (show on my Ed white and 1960 - 1970)
Version 2: The one pictured on the OP's watch, it is the same printing style as the later (named) service bezel but note the thinner printing of the numbers compared to version 3. Date from 1970's - unknown (I'm still trying to compile some concrete evidence on this)
Version 3: The one fitted to my 145.022-76, this type is most commonly seen, the printing is the same style as verison 3 but the number printing is thicker than version 2. I believe this style came in mid 70's and runs to today)
It is my belief that this decimal bezel version 2 was introduced in the early 70's and is still used up to today in version 3.
I base this on the available images I can find on the web and also I have a friend with a nos sealed decimal bezel with type 3 printing but in a 1970's grease paper style omega parts pouch (with sealed omega parts sticker over the opener)
It is my belief that the bezel fitted to the OP's watch may be original to the watch and as fitted when new (although still of the service bezel print type). The patina on the bezel is clearly similar to that on the watch itself
