Fortis value?

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A Fortis Fieger chronograph, also a certified chronographer. One I haven't seen often, it has a 24 hour dial and a date. All boxes and paperwork (chrono cert) I think it is a 7750 with modifications.
 
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Is it a certified chronometer or does it come with a guy who is a certified chronographer to operate your watch for you?
 
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Certified chronometer with papers from the Swiss testing outfit. I believe that I can figure out how it works, other than the 24 hour sub dial its the same as my Breitling Chronomat.
 
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Try the eBay advanced search feature to look for SOLD items. It can also be helpful to see if there have been recent listings in the sales section on various watch collector forums.
 
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Looked there first, can not find the exact model. The basic same watch without the 24hr complication has several models. Also a wide range of prices. Will have to look at some collector forums.
 
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Looked there first, can not find the exact model. The basic same watch without the 24hr complication has several models. Also a wide range of prices. Will have to look at some collector forums.

Just to be clear, I'm talking about eBay sales, not listings. You don't necessarily need to find the exact model, that's hard to do. Just find comparable models and make adjustments to the prices based on features and condition.
 
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Yes, looked there as well. I did not see the watch currently some old sales. 598.10.151.1. Seems a bit rare.