Lathe restoration SN20

[Toolmaker51]

Right off, I'd google for images of that model. Is the machine graduated metric or imperial? Equipment seemingly not so prevalent on one continent can be prominent elsewhere.
1] Count gear teeth outside the headstock, pitch of lead screw, and mark them with a paint pen.
2] Overall, you'll be more interested in feed and threading plaques than RPM. Feeds can be measured by a protractor and travel indicator, provided you can rotate spindle manually.
3] There I'd open an excel spreadsheet and place info recorded in cells. Calculations will be just division and multiplication.
4] Speeds can be determined numerous ways. Depending on electrical supply, Hz and voltage in particular, you can determine via motor tag at your power available.

I helped generate plaques once in this very process. With all info compiled, spreadsheet was artwork for brass plates to be photo acid etched; fonts, decimals, arrows and all. Brass plates can be thickness of shim stock on up. Surprisingly low cost compared to engraving, and realistic standing figures, vs those in relief. Either can backfill with paint highlighting. There are companies that will cast from a pattern, costly and lesser distinct detailing.

[TexBuxer]

Right off, I'd google for images of that model. Is the machine graduated metric or imperial? Equipment seemingly not so prevalent on one continent can be prominent elsewhere.
1] Count gear teeth outside the headstock, pitch of lead screw, and mark them with a paint pen.
2] Overall, you'll be more interested in feed and threading plaques than RPM. Feeds can be measured by a protractor and travel indicator, provided you can rotate spindle manually.
3] There I'd open an excel spreadsheet and place info recorded in cells. Calculations will be just division and multiplication.
4] Speeds can be determined numerous ways. Depending on electrical supply, Hz and voltage in particular, you can determine via motor tag at your power available.

I helped generate plaques once in this very process. With all info compiled, spreadsheet was artwork for brass plates to be photo acid etched; fonts, decimals, arrows and all. Brass plates can be thickness of shim stock on up. Surprisingly low cost compared to engraving, and realistic standing figures, vs those in relief. Either can backfill with paint highlighting. There are companies that will cast from a pattern, costly and lesser distinct detailing.

I found this, other smaller plates still missing. I'm not going to make full restoration, only functional. I need lathe in my hobbies.

[Toolmaker51]

I found this, other smaller plates still missing. I'm not going to make full restoration, only functional. I need lathe in my hobbies.

Call yourself Long John Silver; this is equivalent of a treasure map! Saves you HOURS of counting and calculations.
What other plates are missing [i.e. where located]?
Next stop Lathes + Machine Tool Archive a near boundless reference. For other materials, there are many Central Europe contributors on this site, certainly familiar with MAS/TOS and Czech language, etc. Just do internet version of raise your hand.

With a 1.8" spindle bore, +15" Ø capacity and that RPM range, you have a powerful, serious lathe. Whatever center distance, those specs tell me "shaft lathe". If you have the tailstock, anything else like steady rests are not hard to fabricate. Restoration isn't always very productive, thorough cleaning is. You can go to town on her; a heap of rags, small brushes, light abrasive pads, citrus based hand cleaners , and some Stoddard or kerosene solvent. Lube a gearhead pal or two with a big sub sandwich and bottled elbow grease IYKWIM.

I haven't run their lathes, but really piled chips with TOS mills in 50 NMTB. I'd say performed well as any better known brands, for lots less moola. Compared to filmy chinesium impressionist abstract machine tools, the eastern bloc built the real deal. Didn't scrimp on iron, fittings or important features, added distinctive attributes, like shifters with positive detents, and best of all real man-sized controls. One of my go-to rants there, ergonomics.

Another, the lecture why this ain't "just a hobby".