| Month | Year | Condition | Price | |
 | Aug | 1968 | Good | $5.30 |
 | Sep | 1968 | Good | $5.84 |
 | Oct | 1968 | Fair | $5.09 |
 | Nov | 1968 | Very Good | $15.49 |
 | Dec | 1968 | Fair | $16.68 |
 | Jan | 1969 | Good | $20.19 |
 | Feb | 1969 | Fair | $14.68 |
 | Mar | 1969 | Fair | $13.97 |
 | Apr | 1969 | Fair | $13.96 |
 | May | 1969 | Fair | $13.24 |
 | Jun | 1969 | Fair | $12.44 |
 | Sep | 1969 | Fair | $11.02 |
 | Oct | 1969 | Good | $12.91 |
 | Oct | 1969 | Fair | $10.08 |
 | Oct | 1969 | Fair | $10.08 |
 | Dec | 1969 | Good | $10.87 |
 | Feb | 1971 | Good | $10.12 |
 | Feb | 1971 | Good | $10.12 |
 | Mar | 1971 | Good | $10.63 |
 | Mar | 1971 | Fair | $7.42 |