We normally do not discuss prices in here. In general I think your latest prices are more in line with what is the going price in the market.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=lemania 13ch&_sacat=0Purchases made through these links may earn this site a commission from the eBay Partner Network
Remember these are often asking, not selling prices.
The downside of the 13CH watches is their relatively small size. Despite the size, I think they are desirable and important for a chronograph collector.
There are several variants of the 13CH. Monopusher (either with a separate button like "ours", or with a button integrated in the crown), and versions with dual buttons.
In combination with dial design and case design, there are many factors that will decide what someone are willing to pay for a watch being offered.
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