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1966 HALF DOLLAR

Mintage:
Circulation strikes: 108,984,932
Proofs: 2,261,583 (Special Mint Set)

Designer: Obverse by Gilroy Roberts; reverse by Frank Gasparro

Diameter: 31 millimeters

Metal Content:
Outer layers - 80% Silver, 20% Copper
Center - 79% Copper, 21% Silver

Weight: 178 grains (11.5 grams)

Edge: Reeded

Mintmark: None (for Philadelphia, PA)
left of the stem of the olive branch on the reverse

Image courtesy of 

Varieties:

Notes:
The finest Uncirculated example graded by PCGS is a single MS-68.

The finest Uncirculated SMS examples graded by PCGS are 36 MS-68's.

The finest Uncirculated Cameo SMS examples graded by PCGS are 6 MS-68's.

The finest Uncirculated Deep Cameo SMS examples graded by PCGS are 3 MS-68's.

Sources and/or recommended reading:
"The PCGS Population Report, April 2003" by The Professional Coin Grading Service