Is the double space key missing? Looks like something should be next to the !/¾ key.

Fleetwing wrote:

Is the double space key missing? Looks like something should be next to the !/¾ key.

​I think what you're looking at is the top of the key lever for another key. I'd have to double-check to be sure, but I believe the -N model did not have the Spaced Typing Key feature. I'm quite certain on the SG3, for example, that the feature was only available on the -S model.

Note that I thought it was refurbished, not rebuilt, whether by Olympia, a typewriter repair shop, or more recently by a collector. Given its age and the professional use that most SG1s would have been subjected to, it's most unusual to see one in 'like-new' condition. And then there are the keys that don't seem to match the machine (I think they've been replaced). The underside of the keys reveals whether they're SG1 or SG3 keys (these are SG1 keys). Take a look at two of the SG1s from my collection below and you'll see what the typical key colours were for each available case finish/colour. Your keys should be the same colour as those on the shift levers.

​Don't get me wrong: You've landed a very nice example that any collector would be happy to have. The keys are just a talking point, and it's not like it effects the value of the machine in any way. I could also be completely wrong about them having been replaced, but I've never come across a '61 model (or any other model year with the dark green paint) with white keys.

​White keys on the 1963 SG1 (note the smooth, lighter green paint):
​And the keys on my 1961 SG1:

Olympia replaced the SG1 with the SG3 in 1963; what effect that might have had on the previous year's sales would be pure speculation on my part, as would an attempt to explain why the 1962 model isn't represented in the database - yet. 

​I would actually caution against reaching any conclusions at all using any information gleaned from the database. At the moment there are some 8,300 machines listed in it. Given that there are around 3,500 typewriters (including peripheral items) for sale on any given day on eBay, and that there are millions upon millions of typewriters still in existence in the world, the database does more to reflect the interests of a very small group of collectors than it does to represent a cross-section of machines that have survived the typewriter century. 

​To provide some proof of this, lets assume that the Olympia serial numbers are accurate so we can extrapolate the SG1 production numbers for the two years you mentioned. In 1961 Olympia produced 152,119 SG1s. In 1962 the number fell a little to 128,486 units, but that's still a lot of typewriters and there should be plenty of '62 models still kicking around, which is why I maintain that you shouldn't read too much into what you see when looking at the database. Providing additional support to my point, I actually have a '62 SG1, but it isn't listed in the database. In fact, a good number of my machines aren't in the database, nor are any of those from a few collectors that I know of in my area that have 60+ typewriters in their own collections.

​This to me is symptomatic of the internet in general; I'm always shocked when I talk to someone who concludes that something must not exist or it must be extremely rare, and only because they couldn't find anything about that item by performing a Google search. There are far too many assumptions made withing the typewriter collecting community in general, but that discussion would veer this thread off topic.