Question on Blake & Lamb

When did they stop making the double spring jump traps? and what was the last year for # 44 jumps?

The B&L # 44 double under was made from 1939 to 1969

Would that be the same time frame for the 44 double long?

My reference material says that the # 44 B&L double long was made from 1957 to 1973.

Thank you wissmiss.