Sinn U50 (Too many to list, please add your watch in the comments below…)
The Sellita caliber SW300-1 is a slim automatic watch movement, Swiss made with 25 jewels. This caliber is the main competitor and clone of the ETA caliber 2892-A2. Many reputable watch companies are using this movement as an alternative to the ETA mechanism due to it being more economical and readily available – and as of 2020, it also offers more power reserve than the ETA.
You may have seen this movement written as the SW-300 but according to Sellita, the correct way to spell this caliber number is SW300 without a hyphen between SW and 300.
Some of the topics covered in this caliber listing:
SW300-1 a VS SW300-1 b:
Generally when you see the caliber number SW300-1 it will be in reference to a 3-hand movement with a date at 3:00, but there is also a No Date version of the SW300-1. The no date version is a real no date without a phantom date position. Sellita officially identifies these as SW300-1 a (date) and SW300-1 b (no date).
Editor’s gripe: This doesn’t seem like the best way to handle caliber designations, but if you’ve spent enough time on this site then you will already know that I don’t like how most watch movement manufacturers and brands handle their caliber numbering. A better way would be to reference the no date version as SW300-1-ND, or have a totally different number such as SW301-1. Some brands use the “SW300-1 a” without a date cutout on the dial, meaning you’d have a no date watch but still with an “SW300-1 a” caliber.
There are technically two versions of the SW300-1:
SW300-1 a – This is the most common variation. It has a date at 3:00.
SW300-1 b – This is a no-date version of the SW300-1. It is a true no-date, meaning that the calendar components are completely removed without any phantom date position.
While the SW200-1 and SW300-1 share many similarities, they are not the same. The biggest difference between the two, as pointed out in the Sellita catalog, is that the SW300-1 is a 1mm slimmer movement. The SW300-1 is 3.6mm thick and the SW200-1 is 4.6mm thick. This makes the SW300-1 a preferred choice for thinner models such as higher end dress watches.
SW300-1 VS SW300-2:
At the time of this post, there is no such thing as the SW300-2. If Sellita makes any major changes to the SW300-1, they may designate the updated movement as SW300-2 to mark an evolution of the SW300-1.
At the time of this post, replacement prices were found online for around $280.00 USD.
CC member Willem submitted the image below of a Sellita SW300-1 found in his MeisterSinger Pangaea watch:
Other Watches with the Sellita Cal. SW300:
Brands using the SW300-1 as a base caliber:
TAG Heuer uses the SW300-1 as a movement for their Calibre 7 movement. If you know of other watch brands with their own caliber designation, but using the SW300-1 to power the watch, please comment below or submit it here.