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The Minting Process
The Minting Process
Slide set from Leroy Van Allen and Bill Fivaz outlining steps in the minting process, along with related errors.
Introduction
Philadelphia Mint
Steps in preparing master hub
Example of designs for the Mar
Preparing plasticene clay mode
Touching-up positive plaster m
Touching-up Galvano copper she
Die making steps
Turret lathe to cut die blanks
Polishing face of die blanks
Die scratch (1921-P Morgan $1)
Die gouge (1890-CC "Tailbar" $
Polishing marks on 1939-D 10c
The Minting Process
Stages of die
Rusted dies
Hubbing operation
Doubled die (188-O $1)
Punching in mintmark
Repunched mintmark (1938-S 1c)
Overmintmark ((1944-D/S 1c)
Overmintmark (1900-O/CC $1)
Repunched date (1894 1c)
Collar making steps
Band saw to cut off collar bla
Finished cent collar
Broken collar (1943-P 5c)
Melting & casting steps
Make-up bins with scrap
Fragment (1c)
Struck on scrap (Jefferson 5c)
Storage area for cast ingots
Lamination - SBA obverse layer
Lamination - SBA reverse clad
Strip preparation stesp
Finishing mill
Coining steps - batch process
Coining steps - aotomated cent
Blanking press
Webbing
Webbing
Clip (Ike $1) - triple clip
Clip (Kennedy 50c) - crescent
Clip (1964-D 1c) - bowtie clip
Riddler
Annealing, cleaning, drying bi
Upsetting mill
Blank planchet - type 1
Blank planchet - type 2
Broadstruck on type 1 planchet
Automated cent coining presses
Off center (Mercury 10c)
Broadstruck on type 1 planchet
Off center (Indian 1c)
Double strike (1977 25c)
Double denomination
Double denomination
Indent (10c blank struck into
Low pressure strike (Mercury 1
Low pressure strike (Kennedy 5
Die crack (1864 1c)
Die crack (1920-D 10c)
Cud (1972-D 5c)
Foldover (Lincoln 1c)
Coining press blank feed chute
San Francisco Assay Office
Conveyor belt to anneal proof
Proof blanks burnishing bin
Proof dies
Polishing die face with diamon
Proof coin press
Proof coin press
1976 Bicentennial 50c, struck
Review
Mint charts production of coin
Galvano, hub production
Rolling strip production
Planchet production
Planchet processing
Feeding and striking
Counting and weighing
Counting and weighing
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