Hi Sven, ( er du dansk ? )
this style of watch is known as a "Jump watch". It is the very first of the digital watches (albeit that it is analog and not led/lcd). I strongly doubt that this watch was produced by Heuer even though the name is clearly printed on the masking dial.
Over the years there have been a few of these styled watches show up on ebay and various other places with a Heuer sheild printed on the front but we have, i'm sorry to say, no real evidence of them being genuine Heuer. I'd like to add that I'm a bit of a jump watch fan myself and have several in my collection. I'd love to be proved wrong by another forum member and then chase a real Heuer jump watch for myself.
I say enjoy your inherited piece for what it is regardless of the brand.
- Darren
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: I inherit this watch, but I don´t know the name of the watch and
: how old it is. Please help me.