Rarer Vintage 18k Longines watch , ref nr identification

Syrte

It’s a pretty cool looking watch, but the same old rules always apply- since it doesn’t have a model name, I don’t think anyone can say anything without opening it.
Crown looks to be a gold plated replacement - also unclear whether the watch is gold or might be a US market gold filled watch.

DirtyDozen12

I suspect that you will struggle to find anyone who recognizes this reference. Longines offered so many references (i.e. case designs) that most collectors simply refer to calibers instead. Additionally, there were many locally-made cases with no Longines reference numbers. I have not seen a case like this one before. Maybe the movement inside is a cal. 27.0, if the case is Swiss-made and 18K.