I am assuming you have the Omega deployant? If so you need to get a strap made specifically for it, otherwise the deployant will be centered on the bottom of your wrist and will be uncomfortable. The buckle (12 o'clock) side of the strap needs to be longer so it will sit correctly. I've tried it with a Hirsch and in addition to having to cut the keeper off the strap making it useless for any other watches the deployant sits too far to the side making it uncomfortable.
The Omega OEM straps are great but somewhat overpriced. If you can go calf I've got a couple of Bob straps made for the Omega deployant from an ebay seller in Germany that are comfortable and look great. Only about $40. Pardon the lousy photo!
EDIT: Here is the strap. You'll need the 18mm deployant to make this one work on a Railmaster. If you have the 16mm deployant it will not work.
Hi I do have an Omega deployant so I think you're saying that Hirsch wouldn't be a viable solution ?
http://www.ebay.com/itm/BOB-Marino-S...item4626ddaacc