I do not agree, I think perhaps to produce a black enamel dial would take 1-2 weeks max per dial per artisan. I reckon 5370's true total output to be around 1000 pieces. The US alone receives upwards of 100-200 spilt second grande comps a year (they are checked and inspected by Henri Stern agency before dispatching to ADs), that is split across 4-6 references and variations. Sure 5204 would take up the majority of that number, but I can hardly see 5372 being produced in greater volume than 5370. So I would estimate 25-50 5370ps being sent to the US per year. That would add up to 125-250 over 5 years. If the USA represents ~25% (an overestimate) of the market, then the overall production is definitely no less than 500 pieces.