First off, I've been in possession of an older (57'?) Olympia typewriter for quite a number of years and recently decided to dig into its heritage. It has two serial numbers as shown in the photos. The 7-167619 is viewable from above while the 8-174360 is viewable underneath. The 1957 SG-1's serial numbers started with 176711, so either of my numbers puts this one as a 1956 model unless I'm missing something. Feedback would be appreciated. 
Secondly, if this was cleaned up but not fully restored, what might its value be, ballpark. To my novice knowledge, there is only one key missing, otherwise it is working order. Thanks in advance for any responses.[img]IMG_20260412_224236764.jpg[/img]