Question on Glass Negative Photo I have

[Inspeqtor]

I have about 200 Glass Negatives taken by wife's Great Uncle back in 1893 at the Chicago Worlds Fair. This is a night time photo which includes the Moon which I am wondering if someone can guess what the time exposure was, but I do not know what would be the best forum would be to post this photo in.
I had posted all of these photographs back in POTN Photography On The Net many years ago.

Thank you for any help you can give me.

 

[DavidWatts]

How about in the Show Your Black and White Film Photos sub-forum?

 

[Inspeqtor]

Thank you David!