reproduction versus original 309 master cylinders
 

Is there things to look for when determining an original 309 from a reproduction? Thank you, Joe

Yes,but easier to show then tell.Do you have a photo of the one you're looking @?

Which side do you want to see?....Joe

All 4 if possible.Top & bottom too.

Real? I know the cap is wrong...Joe

Doesnt have the date code like mine has?

There is something there but I'll have to look and see if I can make it out. Should've taken the picture without the bales...Joe

How is the pad with the "US" stamp? I know that even as clean as my original is, I can't make out the US anymore. That's usually the biggest thing being re-stamped/forged I think. I can just barely see it in one of your pics.

You can read "US" but it's not real pronounced...Joe

To me, that's a good sign of probable originality that it's not a nice clear stamp.

----All the machined pads should be bare metal as they were machined after the case was painted. That's why so many stampings on the front are rough from rusting. As well, the dates I have seen are often illegible. Not sure why......Bill S

Can you take a close pic of that US stamp? What I see looks like a small font US stamp which is not right.
I see the date code is behind the bale.

There are quite a few 309s where the casting date is completely illegible.

Here's a couple more pictures. Thank you, Joe