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From my research, W. Philbrook used a different location than Ron Cooper. But there are a bunch of images you can find on the web showing known Ron Cooper frames with the mark in between the chain stays. But I have not been able to find equivalent photos of the punch mark on Philbrook...

Lol OK..... um, thanks for the assistance, I guess? It's not where I think it is, OK I hear you--- but it's not permitted to tell me where it actually might be found? I guess I'll go on waiting to be initiated into the inner circle of the shadow council. Or maybe I'll just go for a ride...

Thanks--- I've seen that Philbrook article on the classiclightweights web site you pasted here, and it's quite a nice history. However, on the subject of the mysterious "punch mark" it mostly serves to cloud the issue further. The relevant parts of the last paragraph assert that 1) several...

Hello folks, I'm looking for some information about Bill Philbrook frames. In researching things, I've come across mention of a small "punch mark" which Mr. Philbrook would use to identify his work. Supposedly this mark would be placed on the bottom bracket shell in front of the chain stay...