Marv
356
There are few sterile JLC
I know several NSA that do not bear any mark on the dial or the glass... and they were sold as it by official AD.
credit p@trice
But I don't think it was purpose-made! 
However, concerning vintage memovox, I know few pocket or travel memovox that had sterile dials. Here is a scan of the U.S. catalog from '67. Look at the first one.
But it does not change that I would not have bid on the watch above.
Best,
it was auctioned today
By: wv : December 1st, 2012-07:27
Hi Nicolas, It was auctioned today at And it was sold. Only pictures of the front. No numbers mentioned. I got curious, because I never saw such a memovox worldtimer. The is no signing of JL at the dial. So I doubt whether it would be a genuine JL. There...
There are few sterile JLC
By: Marv : December 2nd, 2012-13:34
I know several NSA that do not bear any mark on the dial or the glass... and they were sold as it by official AD. credit p@trice But I don't think it was purpose-made! :) However, concerning vintage memovox, I know few pocket or travel memovox that had s...