The A Michel 498 watch movement is a hunter or open face calibre which features a bimetallic screw balance and a Breguet hairspring. While few Bulla calibres up to 13''' are listed in popular movement catalogs, they can occasionally be found under brands such as E.J., Juillard, or Emile Juillard. The A Michel 498 movement includes functions such as stem wind and set, sub second, and was commonly used around the period of 1930.