No, it's (really) a 40mm !?
http://www.silix-prime.com/pans005-p-3581.html
Name: PANS005
Model: PANS005
Product Description
Dimension: 40mm x 52mm x 12mm
Hello,
I sent a mail to SilixPrime 2 days ago, cause there's several 40 / 42 mm PAMs on his website, but there are some mistakes on the descriptions.
Michelle (from Silix staff) told me that the only 40mm PAM they are selling is this one :
http://www.silix-prime.com/pans005-p-3581.html
It looks good, but I didn't see this movement anywere else.