Just overhauled this lovely SM2 for the missus. It happens to be close to a favorite color of hers and after she saw a photo of a Smith-Corona 2C in burgundy, she said she wanted one. Well, those are selling for well above what I'm willing to pay for a typewriter, so I just passively kept my eyes open for a similar machine.
I found this SM2 which dates from 1953.
This one cost significantly less than what I was expecting.

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It arrived with the carriage lock engaged but also nearly 40 years of lube completely gummed up and it was still locked for two days during a PB blaster soaking. Chassis bushings were melted and runny, which was expected. This was one of the mechanically dirtiest typewriters I've seen, with nothing working right or at all. The line lock was engaged from all of the old dried oil, so I didn't know if it worked at all.  
A tech's label under the ribbon cover shows that the last time it was serviced was in 1980. The platen is Shore 97, so I'm willing to bet it was re-covered or replaced at that time. The rollers are still soft, and the feet are in really good condition. 
=13pxDay before yesterday, I checked the carriage and was pleasantly surprised when it moved.
Yesterday morning I did a thorough cleaning of the machine and then lubed up the appropriate parts for reassembly.
Last night I worked for maybe 5 hours doing some intense detail cleaning and polishing, then reassembled it, cut some new chassis bushings, stuck in a ribbon and voila! It's a lovely typer! 

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I'm a bit envious, and now I may have to seek out my own carriage-shifted Olympia SM, but I have too many already, so no rush. I still have a glossy black Smith-Corona 2C to overhaul.

Phil Forrest