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Chouinard - Tube Chocks
- Early 1973 set #4, 5, 6
- Mfg mark: Long "C" in diamond
- No end notches
This #5 Chouinard Tube Chock has a #4 and #5 mfg mark on it.
- Photo by Tim Ryan
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Chouinard - Tube Chock
- The 1973 Chouinard Tube Chocks came in sizes #4, 5, 6

- 1973, #4
- Mfg mark: Round "C" in diamond
- "JH" mark - unknown
- No end notches
The mfg mark on this tube chock is on the top next to the edge.
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Chouinard - Tube Chocks
- In 1974 Chouinard added two new Tube Chock sizes, 4 1/2, and 5 1/2
- Some were marked 4.5 and 5.5

- Mfg mark: Round "C" in diamond
- No end notches
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Chouinard - Tube Chocks
- The 1975 Chouinard Tube Chocks came in sizes 4, 4 1/2, 5, 5 1/2, 6

- 1975,  #5, 6
- Mfg mark: Round "C" in diamond
- Notches on ends