Looks quite attractive at first glance being boxed, having multi coloured scales and also the attractive darkened ( maybe blued ) chronograph seconds hand. Movement is a Landeron 248 which is decent, pretty reliable and serviceable if there are any issues.
When looking a bit closer though I see re-filled hands and a case that doesn´t look anything like it has been in a safe for 40 years and is certainly not NOS. In fact it looks to have been polished quite heavily. I also note that the back case states `stainless steel back base metal`, I can only assume it is describing the front part of the case, so that is also something to think about.
Diwen is not a brand I have ever heard of, that does not make it rare, that just means that it is probably one of countless `Chronograph Suisse` brands from this period who bought in cases, movements, hands and dials and then marked them with a name and sold them through department stores and jewellers in the 60´s and early 70´s.
As for the price, maybe I am tight but I would like it a lot better at $250-300,or if in 18kt, $600-700.
I would avoid at this price and in this condition.
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