A Breitling Top Time Ref 2003 has come up for sale in my area recently. It's quite nice and the price is on the cheaper end of the scale. I haven't seen the movement but it has been service by a reputable watchmaker about a year ago. In the watchmakers documentation it states that the movement is a Valjoux 7730. From my research online it would seem that the Ref 2003 was fitted with a Venus 188 (https://thespringbar.com/blogs/guides/collectors-guide-to-breitling-top-time).

Does anyone know if the 7730 was ever fitted to the 2003 or is this movement not original to this watch?