Why collectors and writers notice it
The SM3 and SM4 share a strong family resemblance. Tabulator controls are among the useful distinctions, but a complete identification should include the badge, controls, serial, and body details.
Identification checklist
- Look for tabulator controls and exact model markings.
- Inspect carriage clearance and body mounts.
- Ask for a long typing sample to reveal alignment and feed behavior.
What changes the buying decision
Keyboard language, carriage width, color, case, cosmetic originality, platen condition, feed behavior, service history, and shipping plan can outweigh the headline model name.
Compare the same generation
Do not combine every listing using the same family name into one mental price range. Sort by body generation, condition, service evidence, completeness, and whether the machine has produced a recent typing sample.
Compare live listings
Open a focused eBay search and compare condition, completeness, seller testing, shipping, and sold history before deciding.
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