Jaeger-LeCoultre

Wondering if anyone can help...I spotted this beat up memovox on a website...any ideas on the ref? I can find similar solid gold versions (ref y1886?) but not in 2 tone steel case / gold numerals...and with a full black alarm indicator. Might be a franken...  

It looks like a Ref 3151. ...  

Ref 3151: Best Blomman ...  

A valuable source of information! Best Blomman

So it has the face (numerals) of the E851 and the lugs of the 3155 / 3151....and the alarm marker is black. A little unusual?

Reference - case and movement. Several different dials were used on the 3151. The example you show here is most likely repainted or replaced alarm disk which would explain the filled alarm marker. I highly doubt this watch looked like this when leaving th... 

I’m learning...slowly...many thanks for getting back to me.