I had both movements on my 005K & 026K changed with this high beat A6497-2 Seagull movement, both running strong about 2 weeks now with +-7 sec/day and very quiet.
Here mate http://www.helenarou.com/6497-mechanical-watch-movement-for-44mm-45mm-47mm-649744454717.html
I bought two of those and my watchsmith put them on my 005K & 026K
This is my first strap from Septimus, always wanted a nice French ammo and this one fits the bill! Details in making it are just awesome!!!
Some quick and dirty shots.