I missed this in my spam filter back on Nov 26 (sorry about that David). I’m not a vintage expert by any means but I swear that tank is a Super X. See this pic HERE. Just a guess though. Anyone else?
This photo is of a family member of mine way back in the day in Sweden and I have not been able to identify the manufacturer even when using a magnifying glass. Can anyone identify this bike?
Dave Ingels
Motorcycle Photo Of The Day 
The logo looks like a diamond superimposed on an “X”
Husquvarna
It’s earlier than the Super X, and check out the girder suspension.
+That looks like a 1917-18 Excelsior. (WWI Military model?)
I think this is what we are looking for
Steve,
I tried to leave a comment but couldn’t get access.
This wonder is a circa 1910 Excelsior V Twin, fastest bike in the world at the time, 1st bike to exceed 100mph. Started in 1905 in Chicago. Purchased by Schwinn in 1911.
I have attached a couple of photos I have.
Hope this helps
Regards,
Kerry M Maloney
12 Aspect Lane
Cranbourne North
Victoria Australia,
Thanks to everyone for identifying this unknown bike! The photo is my mother’s Uncle Martin Fredrikssen in Sweden probably around 1920-23 before my grandparents immigrated to the U.S. from Sweden. I appreciate Uncle Martin for possessing the motorcycling DNA that thankfully passed on to me.
Uncle Martin is sitting on a chain drive Excelsior 7-C (1913-14?) earlier models were belt driven like in the video. NO expert here either but lots of info out there on the intertube. Thanks for giving us the
idea to expand.
The logo is an x with over two wings, it’s a Nimbus bike, no doubt.