I am currently thinking of getting one of these machines and was mooching around the shops online and came across one for sale which says its a SWCM

Ok fine but this one has a chrome lens and I was under the impression that the chrome lens ones were 'SWC' from the 60's and that the SWCM was a later version. I cant make out the serial number on the lens nor can I see if has T* on it.

So question is, if it is an older version is it worth looking at or leaving?
Reason it being very old and possible issues with its shutter and the inability to get it fixed if it goes wrong?