Crank Stamps "Circle M"

[dasberger]

Pulled the crank off one of my 20's Schwinn's... don't believe the crank to be original. The only stamp is a "Circle M". Could be a "W" but it reads like an M to me

Any insight into maker appreciated

 

[GTs58]

I guess you could call that a stamp. It was stamped in the casting sand.

Some months back I was doing a search on the same subject and came across a site that had all the foundry symbols that were active during WWII. I'll be damned if I can find it now. I doubt that was a Wald symbol though. I'll do another search for that site.

 

[all riders]

Nope. it was Stamped in the finishing die of a multi-die drop forging process. Any lines you may see elsewhere that make it look like it has casting "flash" are from the metal being squeezed past the edges of the dies

 

[Krakatoa]

Let's see the other side of the crank are there any stamped or in die # here?

 

[dasberger]

That's all there is

 

[SKPC]

Here is a dogleg "M" stamped crank. I do not know how or where I 1st acquired it, which doesn't help.

 

[J-wagon]

I have a circle M stamped dogleg. Was told came from Excelsior Elgin.

 

[dasberger]

The two examples above have an extra letter maybe pointing to a date? They are also straight in the center while mine is arched... Someone out there knows something!

 

[J-wagon]

Saw this circle M crank in For Sale
Thread 'Mead Ranger' https://thecabe.com/forum/threads/mead-ranger.203752/

 

[dasberger]

Saw this circle M crank in For Sale
Thread 'Mead Ranger' https://thecabe.com/forum/threads/mead-ranger.203752/

View attachment 1564615

Reached out to see if he knew what year bike it was on