Help on a Porsche Design chronograph 7176 lemania 5100

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Good day. Im new to this forum and have a watch that Im struggling to date. The Reference on the case back is 7176D its got the Lemania 5100 Movement (signed LEMANIA WATCH LTD) its got an Orfina signed inside case back and the Orfina logo on the clasp. Also the airplane hand in orange. I had originally thought it was 1970s but the serial number (I've blocked some of it out) looks very high. 2031****
Were they making these in the 1990s too?

any help gratefully apreciated

thank you
Agree with watchuwant that this is a put together. But other non-original parts were used in your watch. It looks like a generic Lemania 5100 movement was used as the rotor is branded Lemania instead of Orfina. Also the serial number is engraved in the upper automatic device bridge which Orfina didn't do. Instead there was a circular recess in the 3/4 bridge plate with a sticker showing the number. And that number would've started with 040, while yours starts with 445.
 
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Good day all,

I have a few questions regarding 7176 and 7177
- is 7176 w/ military 3H dial and a tachy bezel have a non signed crown?
- I once saw a 7177 with white date wheel. Something i rarely see..a PD with whte day date wheel. Is it legit?

Thank you
 
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Depends which Military ... Issued outside the back or just a replacement dial? Most issued PD's had 1-12 bezels. Not a Tachy bezel. White D/D wheels ? Which language ?
 
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So, the only mark for the military issued is the 12H chapter ring?