I am considering buying a vintage Zenith chronograph at some point and started looking around. Beautiful watches. I’ve done some research on-line to learn about Zenith chronograph movements caliber 143-6 (Excelsior Park) and 146 (Martel). Both column wheel hand wound chronograph movements seem well regarded. However, I haven’t found any comparison between the two. If anyone is knowledgeable about these two calibers to offer a comparison, it would be greatly appreciated. Thank you.