Below is what I have so far. The only oddball is 3104xx Jan 74 - all the rest have serial and date in order. The certification labels say "Date of manufacture" but that is hard to understand - we know that the dates are well before the dates in the records AN has. Here are the ways the dates might make sense to me:
- The frame was prepared including the certification label and "put on a shelf". When the engine was later installed it was stamped to match.
- The engine was built and "put on a shelf" with a tag saying when it was built. The certification label was stamped once the engine was in the frame.
From the limited factory records I've seen, the certification label dates precede, usually by a lot, the dates in the records for 850s.
Using Feb 73 - Feb 74 (middle of the month) we get about 1010/month. Using all, we get about 1128/month. Using Feb 74 - Aug 74, we get about 1365/month. Since 750s were still being "built" in 1973 they would have been cutting into the 850 numbers in 73. So, I think the average was 1200-1300/month for 850s.
Would like more data points, especially info on the lowest and highest numbered pre-MKIII 850. More data points will increase the accuracy.
300376 Feb 73 ???
3017xx ??? RH4
307241 May 73 RH4
307542 Aug 73 RH10
3077xx Sep 73
3087xx Sep 73 RH10
308743 ??? RH10
309643 Oct 73 RH10
310311 Nov 73 RH10
3104xx Jan 74
3104xx Nov 73
310528 Nov 73 RH10
311032 Dec 73
311188 Dec 73 RH10
312xxx Feb 74
315114 May 74 RH10
31604x Jun 74 RH10
31661x Jun 74 RH10
320691 Aug 74
If people are willing to provide the info, I would be happy to compile it for the 750s and MKIIIs as well.