Photographed collector reference · Case & bottom stamp
1971 · Regular · Bradford · Copper · Kennecott — Case & bottom stamp reference (1971)
1971 · Regular · Bradford · Copper · Kennecott: Kennecott-associated copper example. The source associates the promotional series with approximately 1966–1973; a general production range should not be inferred solely from this pictured stamp.
- Known period
- 1971
- Plant
- Bradford / United States
- Case type
- Regular
- Case material
- Copper
- Dating evidence
- Collector-reported reference — A collector or source has documented this example or attribution. The exact year, manufacturing history or classification may not have been independently verified.
- Reference verification
- Photographed specimen; date or classification attributed to the source, not factory-certified.
- Year attribution
- source-attributed
Reference images · real photographed examples
Kennecott-associated copper example. The source associates the promotional series with approximately 1966–1973; a general production range should not be inferred solely from this pictured stamp.
Dating evidence and reference verification
Sources: J. Kim
Collector-reported reference: A collector or source has documented this example or attribution. The exact year, manufacturing history or classification may not have been independently verified.
Reference verification: Photographed specimen; date or classification attributed to the source, not factory-certified.
Photographic copyright: J. Kim
Dating caution. Case and insert can have different manufacture dates; inserts may have been replaced. A single feature does not establish authenticity.