21mm SK21. Excellent Condition - No Buckle. 

21mm Fitment - I am not certain. * Please confirm fitment for yourself. The model number is visible in pictures (SK21) You are more knowledgeable than I am if looking at this strap. 

Retail I believe is $300.

$135 Shipped CONUS. Zelle or Venmo FF. Pics and timestamp in the listing