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I have been going through some old parts and noticed something I had not seen before. There appears to be a difference between early bridge assemblies. The legs of the bridge have a hole on the top for the adjustment tool. There seems to be a version with a small hole and another with a larger hole. Can anyone expand on my observation. Is one earlier than the other? If so, when did the change occur?

Thanks in advance for your help,
Steve

The order seems to be:

Bridges with domes over the posts: 1958-1969ish
Bridges with smaller holes but no domes: 1969 onward

Bridges with larger holes are newer reissues or by Staytrem.
Also, you can check to see if they are SAE or metric. Metric parts will be newer.