The tonneau-shaped watches with Cal. 87 movements don't feature much on the Forum these days and it's worth a look through the archive.
Firstly some details:
An original example:
https://www.iwc.com/member/forum/search_all.asp?table=archives&subject=1930s&archived=yes&id=46202
A Cal. 87 I should have never sold... by MF:
In platinum:
https://www.iwc.com/member/forum/search_all.asp?table=archives&name=mf&subject=wife&archived=yes&id=155955
And Art-Deco (and a lot were):
Cheers from the cellar