adding to the work above...
i have a speedy triple cal; i think Speedy's are GORGEOUS!!!, but you will be VERY hard pressed to find that strap available separately... if it could be bought (cordura with red stitching) i would own it already.
i've seen a limited edition rubber strap with speedmaster written in yellow and i even took down the model number and googled it but you cant get them as far as i know.
However, it seems that you can more easily get what you are looking for from Tag and for less money.
i think you should hunt this one:
it will be right in your price range or slightly above. there is one in titanium with a carbon face and the red stiching on the strap for 30% off at the Tag dealer near me (in Canada though).. i think that's where you need to be