Identity boundary
Labels currently in scope
- 221
- 221K
- 221J
- 222
- 222K
Evidence note: High collector and parts activity; the 222 free arm prevents blanket 221/222 interchange claims.
AUDITED CANDIDATE · QUEUE #2
Singer Featherweight 221 / 222
This dossier also has a public research-cluster page. Publication records the evidence boundary; it does not confirm a shared mechanical platform or part compatibility.
Source audit
2 model-level source leads
- collectorDIRECT DOCUMENT
Singer 221 Featherweight service manual
The document names motor and wiring variants; 222K requires its own tubular-bed comparison.
service manual · Covers: 221-1, 221K4, 221K5, 221K7 · Checked 2026-09-07 · Link only - collectorMODEL CATALOG
ISMACS Singer classes 200–299 model catalog
Documents 222K as a tubular-bed derivative, which is a boundary rather than an interchange claim.
model catalog · Covers: 221, 221K, 221J, 222K · Checked 2026-09-07 · Link only
Free demand evidence
24 unique autocomplete leads
US / English snapshot collected 2026-09-07. This measures suggestion breadth only—not monthly search volume.
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6 suggestions · ok
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