Hello everyone,
So, I always thought that my second-hand vm38 looked a bit different from the ones you have. After some search I found this article:

http://www.vintagebikebuilder.com/vm38ss-vm38-9-comparison.html

Have you ever seen any of this models?

I plan on cleaning and checking which jets are installed on mine, I will take some pictures

The SS version with the shorter bell, use to show up on eBay fairly often.  I haven’t searched for them for years so don’t know the situation now.  A lot of the used VMs I purchased were worn beyond use and came with “you guess” jets, you never knew.