Marin Bear Valley (1993) Seat post clamp bolt help

[79stef]

Im after some help trying to get a seat post clamp bolt for my Marin Bear Valley from 1993. At the moment I'm not fussed whether or not it's an original part, I just need the seat tube to stay put!
The external seat tubing has a diameter of 28.6mm. The length of frame where the bolt clamps is 34mm.
There is a notch for a suitable bolt on the left hand side.

Any help appreciated (especially if you have one you can sell me!)

 

[Tootyred]

I thought 93 had a drilled marin qr on? Rather than a binder bolt.

 

[79stef]

I thought 93 had a drilled marin qr on? Rather than a binder bolt.

This is indeed how it looks on other pics I've seen on the Web. So is the 'notch' in the left hand hole, pictured, irrelevant in this case?

I think you're right and I'm being daft as a binder bolt wouldn't sit in a flanged housing like this, would it..