dose anyone know what size strap will fit the watch. the case size is 41mm i believe

 

The 38.5 mm lug width is 19 mm. I thought the larger 41 mm cases had a 21 mm lug width.

 

The 41 mm AT case lugs are 21 mm.

 

Not necessarily. My 2254 is described as 41.5mm by OMEGA. Its lugs are 20mm.

 

the first gen AT2500 39.2mm are 20mm lugs width. the AT8500 38.5mm are 19mm. Not sure about >40 but different sizes and gens are different