Mills 0.75 compression screw

[Martin McIntosh]

I once read that you can decipher the serial numbers to pinpoint the date of manufacture. Somebody on here must have the key to this.

 

I looked at the screw in my Mk1 1.3 and it is indeed flat, but the Mk2 0.75 is domed with a small machined flat at the centre to increase contact pressure. I could swear that I have seen some concave ones.

Edited By Martin McIntosh on 11/04/2020 13:54:42

[brokenenglish]

Posted by Martin McIntosh on 11/04/2020 13:30:22:

I once read that you can decipher the serial numbers to pinpoint the date of manufacture. Somebody on here must have the key to this.

Yes Martin, I've read that as well. I think it falls into the category of "unsupported conjecture" and, personally, I don't believe it. Many times I've tried to fathom some kind of logic in the Mills numbers, over nearly 70 years, and I've never found a coding system that remained plausible over a significant number of engines.
My personal opinion is that the numbers only mean something to Mills production staff (sequential batch numbering plus sequential engine numbering or something similar), with numbers that don't have any significance other than being a unique identifier for the engine concerned.
Then again, I could be wrong of course! Maybe there's something I'm missing.

Edited By brokenenglish on 11/04/2020 14:40:07

Edited By brokenenglish on 11/04/2020 15:02:19