For example I've estimated Tank Louis ref. 78086 production at 15000 i.e. I've documented
link serial
link numbers up to 14xxx. I assume the Tank Louis is the most common model because well it's The Tank. Meanwhile others have estimated production of the Coussin "Bamboo"
link at just 250 examples presuming it to be the rarest or most obscure of the bunch.The caseback will also be stamped with gold hallmarks though these have sometimes been polished away over the years.