Thank you so much for this answer! I will also immediately put in an order for that book.

Hi, I am new to this forum but a big vintage JLC-fan. I am currently sourcing for a vintage Memovox E861. I have found a good example but am unsure if the caseback is correct as it is stamped 'LeCoultre' rather than Jaeger-LeCoultre which is printed on the dial and stamped on the movement. Shouldn't...