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Two years ago, I wrote about the P-1956 mainspring from Merritt’s Antiques. This spring was ideal for many antique American clocks.

My newest batch of these mainsprings (received late in 2009) are weaker than the first batch I had. When removed from their clamp, they open out to only 5 1/2 inches (my first batch opened to about 11 inches).

These springs may be too weak for clocks with a recoil escapement. I still need to test them in a Seth Thomas No. 89 movement.

Related posts:

1. New Batch of Merritt’s Clock Mainsprings
2. Merritt’s Antiques P-1956 Mainsprings
3. Measurement of Mainsprings for 8-Day American Antique Clocks, June 2010
4. Mainsprings for American 8 Day Clocks
5. Mainsprings for Seth Thomas Oak Kitchen Clock
6. Schatz 1000 Day Clock Made in March 1956